diff --git a/packages/e2e-tests/fixtures/block-transforms.js b/packages/e2e-tests/fixtures/block-transforms.js
index bf1e218958c41a..6813381a4dd102 100644
--- a/packages/e2e-tests/fixtures/block-transforms.js
+++ b/packages/e2e-tests/fixtures/block-transforms.js
@@ -7,6 +7,12 @@ export const EXPECTED_TRANSFORMS = {
 		originalBlock: 'Archives',
 		availableTransforms: [],
 	},
+	core__audio: {
+		originalBlock: 'Audio',
+		availableTransforms: [
+			'File',
+		],
+	},
 	core__button__center: {
 		originalBlock: 'Button',
 		availableTransforms: [],
@@ -15,6 +21,36 @@ export const EXPECTED_TRANSFORMS = {
 		originalBlock: 'Calendar',
 		availableTransforms: [],
 	},
+	'core__media-text': {
+		originalBlock: 'Media & Text',
+		availableTransforms: [
+			'Image',
+		],
+	},
+	'core__media-text__image-alt-no-align': {
+		originalBlock: 'Media & Text',
+		availableTransforms: [
+			'Image',
+		],
+	},
+	'core__media-text__is-stacked-on-mobile': {
+		originalBlock: 'Media & Text',
+		availableTransforms: [
+			'Video',
+		],
+	},
+	'core__media-text__media-right-custom-width': {
+		originalBlock: 'Media & Text',
+		availableTransforms: [
+			'Video',
+		],
+	},
+	'core__media-text__video': {
+		originalBlock: 'Media & Text',
+		availableTransforms: [
+			'Video',
+		],
+	},
 	core__categories: {
 		originalBlock: 'Categories',
 		availableTransforms: [],
@@ -29,10 +65,52 @@ export const EXPECTED_TRANSFORMS = {
 		originalBlock: 'Columns',
 		availableTransforms: [],
 	},
+	core__cover: {
+		availableTransforms: [
+			'Image',
+		],
+		originalBlock: 'Cover',
+	},
+	core__cover__video: {
+		availableTransforms: [
+			'Video',
+		],
+		originalBlock: 'Cover',
+	},
+	'core__cover__video-overlay': {
+		availableTransforms: [
+			'Video',
+		],
+		originalBlock: 'Cover',
+	},
 	core__embed: {
 		originalBlock: 'Embed',
 		availableTransforms: [],
 	},
+	'core__file__new-window': {
+		originalBlock: 'File',
+		availableTransforms: [],
+	},
+	'core__file__no-download-button': {
+		originalBlock: 'File',
+		availableTransforms: [],
+	},
+	'core__file__no-text-link': {
+		originalBlock: 'File',
+		availableTransforms: [],
+	},
+	core__gallery: {
+		originalBlock: 'Gallery',
+		availableTransforms: [
+			'Image',
+		],
+	},
+	core__gallery__columns: {
+		originalBlock: 'Gallery',
+		availableTransforms: [
+			'Image',
+		],
+	},
 	'core__heading__h2-em': {
 		originalBlock: 'Heading',
 		availableTransforms: [
@@ -51,6 +129,69 @@ export const EXPECTED_TRANSFORMS = {
 		originalBlock: 'Custom HTML',
 		availableTransforms: [],
 	},
+	core__image: {
+		originalBlock: 'Image',
+		availableTransforms: [
+			'Gallery',
+			'Cover',
+			'File',
+			'Media & Text',
+		],
+	},
+	'core__image__attachment-link': {
+		originalBlock: 'Image',
+		availableTransforms: [
+			'Gallery',
+			'Cover',
+			'File',
+			'Media & Text',
+		],
+	},
+	'core__image__center-caption': {
+		originalBlock: 'Image',
+		availableTransforms: [
+			'Gallery',
+			'Cover',
+			'File',
+			'Media & Text',
+		],
+	},
+	'core__image__custom-link': {
+		originalBlock: 'Image',
+		availableTransforms: [
+			'Gallery',
+			'Cover',
+			'File',
+			'Media & Text',
+		],
+	},
+	'core__image__custom-link-class': {
+		originalBlock: 'Image',
+		availableTransforms: [
+			'Gallery',
+			'Cover',
+			'File',
+			'Media & Text',
+		],
+	},
+	'core__image__custom-link-rel': {
+		originalBlock: 'Image',
+		availableTransforms: [
+			'Gallery',
+			'Cover',
+			'File',
+			'Media & Text',
+		],
+	},
+	'core__image__media-link': {
+		originalBlock: 'Image',
+		availableTransforms: [
+			'Gallery',
+			'Cover',
+			'File',
+			'Media & Text',
+		],
+	},
 	'core__latest-comments': {
 		originalBlock: 'Latest Comments',
 		availableTransforms: [],
@@ -175,4 +316,12 @@ export const EXPECTED_TRANSFORMS = {
 			'Paragraph',
 		],
 	},
+	core__video: {
+		originalBlock: 'Video',
+		availableTransforms: [
+			'Cover',
+			'File',
+			'Media & Text',
+		],
+	},
 };
diff --git a/packages/e2e-tests/fixtures/blocks/core__audio.html b/packages/e2e-tests/fixtures/blocks/core__audio.html
index cfa3f20267c4bf..0427dd2b8115d8 100644
--- a/packages/e2e-tests/fixtures/blocks/core__audio.html
+++ b/packages/e2e-tests/fixtures/blocks/core__audio.html
@@ -1,5 +1,5 @@
 <!-- wp:core/audio {"align":"right"} -->
 <figure class="wp-block-audio alignright">
-    <audio controls="" src="https://media.simplecast.com/episodes/audio/80564/draft-podcast-51-livePublish2.mp3"></audio>
+    <audio controls="" src="data:audio/mpeg;base64,/+MYxAAAAANIAAAAAExBTUUzLjk4LjIAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"></audio>
 </figure>
 <!-- /wp:core/audio -->
diff --git a/packages/e2e-tests/fixtures/blocks/core__audio.json b/packages/e2e-tests/fixtures/blocks/core__audio.json
index f9acbfdd8ce2d9..3bdbd2f5c104a8 100644
--- a/packages/e2e-tests/fixtures/blocks/core__audio.json
+++ b/packages/e2e-tests/fixtures/blocks/core__audio.json
@@ -4,13 +4,13 @@
         "name": "core/audio",
         "isValid": true,
         "attributes": {
-            "src": "https://media.simplecast.com/episodes/audio/80564/draft-podcast-51-livePublish2.mp3",
+            "src": "data:audio/mpeg;base64,/+MYxAAAAANIAAAAAExBTUUzLjk4LjIAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA",
             "caption": "",
             "autoplay": false,
             "loop": false,
             "align": "right"
         },
         "innerBlocks": [],
-        "originalContent": "<figure class=\"wp-block-audio alignright\">\n    <audio controls=\"\" src=\"https://media.simplecast.com/episodes/audio/80564/draft-podcast-51-livePublish2.mp3\"></audio>\n</figure>"
+        "originalContent": "<figure class=\"wp-block-audio alignright\">\n    <audio controls=\"\" src=\"data:audio/mpeg;base64,/+MYxAAAAANIAAAAAExBTUUzLjk4LjIAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\"></audio>\n</figure>"
     }
 ]
diff --git a/packages/e2e-tests/fixtures/blocks/core__audio.parsed.json b/packages/e2e-tests/fixtures/blocks/core__audio.parsed.json
index 8024c293a5498f..3dd1c181b54c12 100644
--- a/packages/e2e-tests/fixtures/blocks/core__audio.parsed.json
+++ b/packages/e2e-tests/fixtures/blocks/core__audio.parsed.json
@@ -5,9 +5,9 @@
             "align": "right"
         },
         "innerBlocks": [],
-        "innerHTML": "\n<figure class=\"wp-block-audio alignright\">\n    <audio controls=\"\" src=\"https://media.simplecast.com/episodes/audio/80564/draft-podcast-51-livePublish2.mp3\"></audio>\n</figure>\n",
+        "innerHTML": "\n<figure class=\"wp-block-audio alignright\">\n    <audio controls=\"\" src=\"data:audio/mpeg;base64,/+MYxAAAAANIAAAAAExBTUUzLjk4LjIAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\"></audio>\n</figure>\n",
         "innerContent": [
-            "\n<figure class=\"wp-block-audio alignright\">\n    <audio controls=\"\" src=\"https://media.simplecast.com/episodes/audio/80564/draft-podcast-51-livePublish2.mp3\"></audio>\n</figure>\n"
+            "\n<figure class=\"wp-block-audio alignright\">\n    <audio controls=\"\" src=\"data:audio/mpeg;base64,/+MYxAAAAANIAAAAAExBTUUzLjk4LjIAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\"></audio>\n</figure>\n"
         ]
     },
     {
diff --git a/packages/e2e-tests/fixtures/blocks/core__audio.serialized.html b/packages/e2e-tests/fixtures/blocks/core__audio.serialized.html
index f7b69332aa8827..af9ba1212fdb38 100644
--- a/packages/e2e-tests/fixtures/blocks/core__audio.serialized.html
+++ b/packages/e2e-tests/fixtures/blocks/core__audio.serialized.html
@@ -1,3 +1,3 @@
 <!-- wp:audio {"align":"right"} -->
-<figure class="wp-block-audio alignright"><audio controls src="https://media.simplecast.com/episodes/audio/80564/draft-podcast-51-livePublish2.mp3"></audio></figure>
+<figure class="wp-block-audio alignright"><audio controls src="data:audio/mpeg;base64,/+MYxAAAAANIAAAAAExBTUUzLjk4LjIAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"></audio></figure>
 <!-- /wp:audio -->
diff --git a/packages/e2e-tests/fixtures/blocks/core__cover.html b/packages/e2e-tests/fixtures/blocks/core__cover.html
index a95fdd0d43f788..bea14565390663 100644
--- a/packages/e2e-tests/fixtures/blocks/core__cover.html
+++ b/packages/e2e-tests/fixtures/blocks/core__cover.html
@@ -1,7 +1,7 @@
-<!-- wp:cover {"url":"https://cldup.com/uuUqE_dXzy.jpg","dimRatio":40} -->
+<!-- wp:cover {"url":"data:image/jpeg;base64,/9j/2wBDAAMCAgICAgMCAgIDAwMDBAYEBAQEBAgGBgUGCQgKCgkICQkKDA8MCgsOCwkJDRENDg8QEBEQCgwSExIQEw8QEBD/yQALCAABAAEBAREA/8wABgAQEAX/2gAIAQEAAD8A0s8g/9k=","dimRatio":40} -->
 <div
 	class="wp-block-cover has-background-dim-40 has-background-dim"
-	style="background-image:url(https://cldup.com/uuUqE_dXzy.jpg)"
+	style="background-image:url(data:image/jpeg;base64,/9j/2wBDAAMCAgICAgMCAgIDAwMDBAYEBAQEBAgGBgUGCQgKCgkICQkKDA8MCgsOCwkJDRENDg8QEBEQCgwSExIQEw8QEBD/yQALCAABAAEBAREA/8wABgAQEAX/2gAIAQEAAD8A0s8g/9k=)"
 >
 	<div class="wp-block-cover__inner-container">
 		<!-- wp:paragraph {"align":"center","placeholder":"Write title…","fontSize":"large"} -->
diff --git a/packages/e2e-tests/fixtures/blocks/core__cover.json b/packages/e2e-tests/fixtures/blocks/core__cover.json
index 8dfaaf80485a88..78ce136bea2b6e 100644
--- a/packages/e2e-tests/fixtures/blocks/core__cover.json
+++ b/packages/e2e-tests/fixtures/blocks/core__cover.json
@@ -4,7 +4,7 @@
         "name": "core/cover",
         "isValid": true,
         "attributes": {
-            "url": "https://cldup.com/uuUqE_dXzy.jpg",
+            "url": "data:image/jpeg;base64,/9j/2wBDAAMCAgICAgMCAgIDAwMDBAYEBAQEBAgGBgUGCQgKCgkICQkKDA8MCgsOCwkJDRENDg8QEBEQCgwSExIQEw8QEBD/yQALCAABAAEBAREA/8wABgAQEAX/2gAIAQEAAD8A0s8g/9k=",
             "hasParallax": false,
             "dimRatio": 40,
             "backgroundType": "image"
@@ -25,6 +25,6 @@
                 "originalContent": "<p style=\"text-align:center\" class=\"has-large-font-size\">\n\t\t\tGuten Berg!\n\t\t</p>"
             }
         ],
-        "originalContent": "<div\n\tclass=\"wp-block-cover has-background-dim-40 has-background-dim\"\n\tstyle=\"background-image:url(https://cldup.com/uuUqE_dXzy.jpg)\"\n>\n\t<div class=\"wp-block-cover__inner-container\">\n\t\t\n\t</div>\n</div>"
+        "originalContent": "<div\n\tclass=\"wp-block-cover has-background-dim-40 has-background-dim\"\n\tstyle=\"background-image:url(data:image/jpeg;base64,/9j/2wBDAAMCAgICAgMCAgIDAwMDBAYEBAQEBAgGBgUGCQgKCgkICQkKDA8MCgsOCwkJDRENDg8QEBEQCgwSExIQEw8QEBD/yQALCAABAAEBAREA/8wABgAQEAX/2gAIAQEAAD8A0s8g/9k=)\"\n>\n\t<div class=\"wp-block-cover__inner-container\">\n\t\t\n\t</div>\n</div>"
     }
 ]
diff --git a/packages/e2e-tests/fixtures/blocks/core__cover.parsed.json b/packages/e2e-tests/fixtures/blocks/core__cover.parsed.json
index 116012372ec345..d682ebabe0b9f5 100644
--- a/packages/e2e-tests/fixtures/blocks/core__cover.parsed.json
+++ b/packages/e2e-tests/fixtures/blocks/core__cover.parsed.json
@@ -2,7 +2,7 @@
     {
         "blockName": "core/cover",
         "attrs": {
-            "url": "https://cldup.com/uuUqE_dXzy.jpg",
+            "url": "data:image/jpeg;base64,/9j/2wBDAAMCAgICAgMCAgIDAwMDBAYEBAQEBAgGBgUGCQgKCgkICQkKDA8MCgsOCwkJDRENDg8QEBEQCgwSExIQEw8QEBD/yQALCAABAAEBAREA/8wABgAQEAX/2gAIAQEAAD8A0s8g/9k=",
             "dimRatio": 40
         },
         "innerBlocks": [
@@ -20,9 +20,9 @@
                 ]
             }
         ],
-        "innerHTML": "\n<div\n\tclass=\"wp-block-cover has-background-dim-40 has-background-dim\"\n\tstyle=\"background-image:url(https://cldup.com/uuUqE_dXzy.jpg)\"\n>\n\t<div class=\"wp-block-cover__inner-container\">\n\t\t\n\t</div>\n</div>\n",
+        "innerHTML": "\n<div\n\tclass=\"wp-block-cover has-background-dim-40 has-background-dim\"\n\tstyle=\"background-image:url(data:image/jpeg;base64,/9j/2wBDAAMCAgICAgMCAgIDAwMDBAYEBAQEBAgGBgUGCQgKCgkICQkKDA8MCgsOCwkJDRENDg8QEBEQCgwSExIQEw8QEBD/yQALCAABAAEBAREA/8wABgAQEAX/2gAIAQEAAD8A0s8g/9k=)\"\n>\n\t<div class=\"wp-block-cover__inner-container\">\n\t\t\n\t</div>\n</div>\n",
         "innerContent": [
-            "\n<div\n\tclass=\"wp-block-cover has-background-dim-40 has-background-dim\"\n\tstyle=\"background-image:url(https://cldup.com/uuUqE_dXzy.jpg)\"\n>\n\t<div class=\"wp-block-cover__inner-container\">\n\t\t",
+            "\n<div\n\tclass=\"wp-block-cover has-background-dim-40 has-background-dim\"\n\tstyle=\"background-image:url(data:image/jpeg;base64,/9j/2wBDAAMCAgICAgMCAgIDAwMDBAYEBAQEBAgGBgUGCQgKCgkICQkKDA8MCgsOCwkJDRENDg8QEBEQCgwSExIQEw8QEBD/yQALCAABAAEBAREA/8wABgAQEAX/2gAIAQEAAD8A0s8g/9k=)\"\n>\n\t<div class=\"wp-block-cover__inner-container\">\n\t\t",
             null,
             "\n\t</div>\n</div>\n"
         ]
diff --git a/packages/e2e-tests/fixtures/blocks/core__cover.serialized.html b/packages/e2e-tests/fixtures/blocks/core__cover.serialized.html
index 306a5a740160a4..0539f03f168f8f 100644
--- a/packages/e2e-tests/fixtures/blocks/core__cover.serialized.html
+++ b/packages/e2e-tests/fixtures/blocks/core__cover.serialized.html
@@ -1,5 +1,5 @@
-<!-- wp:cover {"url":"https://cldup.com/uuUqE_dXzy.jpg","dimRatio":40} -->
-<div class="wp-block-cover has-background-dim-40 has-background-dim" style="background-image:url(https://cldup.com/uuUqE_dXzy.jpg)"><div class="wp-block-cover__inner-container"><!-- wp:paragraph {"align":"center","placeholder":"Write title…","fontSize":"large"} -->
+<!-- wp:cover {"url":"data:image/jpeg;base64,/9j/2wBDAAMCAgICAgMCAgIDAwMDBAYEBAQEBAgGBgUGCQgKCgkICQkKDA8MCgsOCwkJDRENDg8QEBEQCgwSExIQEw8QEBD/yQALCAABAAEBAREA/8wABgAQEAX/2gAIAQEAAD8A0s8g/9k=","dimRatio":40} -->
+<div class="wp-block-cover has-background-dim-40 has-background-dim" style="background-image:url(data:image/jpeg;base64,/9j/2wBDAAMCAgICAgMCAgIDAwMDBAYEBAQEBAgGBgUGCQgKCgkICQkKDA8MCgsOCwkJDRENDg8QEBEQCgwSExIQEw8QEBD/yQALCAABAAEBAREA/8wABgAQEAX/2gAIAQEAAD8A0s8g/9k=)"><div class="wp-block-cover__inner-container"><!-- wp:paragraph {"align":"center","placeholder":"Write title…","fontSize":"large"} -->
 <p style="text-align:center" class="has-large-font-size">
 			Guten Berg!
 		</p>
diff --git a/packages/e2e-tests/fixtures/blocks/core__file__new-window.html b/packages/e2e-tests/fixtures/blocks/core__file__new-window.html
index 9c489088ce5056..eeded36a76419b 100644
--- a/packages/e2e-tests/fixtures/blocks/core__file__new-window.html
+++ b/packages/e2e-tests/fixtures/blocks/core__file__new-window.html
@@ -1,3 +1,3 @@
-<!-- wp:file {"href":"http://localhost:8888/wp-content/uploads/2018/05/keycodes.js","showDownloadButton":true,"id":176} -->
+<!-- wp:file {"href":"http://localhost:8888/wp-content/uploads/2018/05/keycodes.js","showDownloadButton":true} -->
 <div class="wp-block-file"><a href="http://localhost:8888/wp-content/uploads/2018/05/keycodes.js" target="_blank" rel="noreferrer noopener">6546</a><a href="http://localhost:8888/wp-content/uploads/2018/05/keycodes.js" class="wp-block-file__button" download>Download</a></div>
 <!-- /wp:file -->
diff --git a/packages/e2e-tests/fixtures/blocks/core__file__new-window.json b/packages/e2e-tests/fixtures/blocks/core__file__new-window.json
index 378ae6dd78d74e..ec9d04253aae3d 100644
--- a/packages/e2e-tests/fixtures/blocks/core__file__new-window.json
+++ b/packages/e2e-tests/fixtures/blocks/core__file__new-window.json
@@ -4,7 +4,6 @@
         "name": "core/file",
         "isValid": true,
         "attributes": {
-            "id": 176,
             "href": "http://localhost:8888/wp-content/uploads/2018/05/keycodes.js",
             "fileName": "6546",
             "textLinkHref": "http://localhost:8888/wp-content/uploads/2018/05/keycodes.js",
diff --git a/packages/e2e-tests/fixtures/blocks/core__file__new-window.parsed.json b/packages/e2e-tests/fixtures/blocks/core__file__new-window.parsed.json
index a29bea33c5b2ba..9893cf0858e14e 100644
--- a/packages/e2e-tests/fixtures/blocks/core__file__new-window.parsed.json
+++ b/packages/e2e-tests/fixtures/blocks/core__file__new-window.parsed.json
@@ -3,8 +3,7 @@
         "blockName": "core/file",
         "attrs": {
             "href": "http://localhost:8888/wp-content/uploads/2018/05/keycodes.js",
-            "showDownloadButton": true,
-            "id": 176
+            "showDownloadButton": true
         },
         "innerBlocks": [],
         "innerHTML": "\n<div class=\"wp-block-file\"><a href=\"http://localhost:8888/wp-content/uploads/2018/05/keycodes.js\" target=\"_blank\" rel=\"noreferrer noopener\">6546</a><a href=\"http://localhost:8888/wp-content/uploads/2018/05/keycodes.js\" class=\"wp-block-file__button\" download>Download</a></div>\n",
diff --git a/packages/e2e-tests/fixtures/blocks/core__file__new-window.serialized.html b/packages/e2e-tests/fixtures/blocks/core__file__new-window.serialized.html
index f132127db9baba..32e45ba306d0bc 100644
--- a/packages/e2e-tests/fixtures/blocks/core__file__new-window.serialized.html
+++ b/packages/e2e-tests/fixtures/blocks/core__file__new-window.serialized.html
@@ -1,3 +1,3 @@
-<!-- wp:file {"id":176,"href":"http://localhost:8888/wp-content/uploads/2018/05/keycodes.js"} -->
+<!-- wp:file {"href":"http://localhost:8888/wp-content/uploads/2018/05/keycodes.js"} -->
 <div class="wp-block-file"><a href="http://localhost:8888/wp-content/uploads/2018/05/keycodes.js" target="_blank" rel="noreferrer noopener">6546</a><a href="http://localhost:8888/wp-content/uploads/2018/05/keycodes.js" class="wp-block-file__button" download>Download</a></div>
 <!-- /wp:file -->
diff --git a/packages/e2e-tests/fixtures/blocks/core__file__no-download-button.html b/packages/e2e-tests/fixtures/blocks/core__file__no-download-button.html
index 54d82d4391f0e3..28574abb0e365d 100644
--- a/packages/e2e-tests/fixtures/blocks/core__file__no-download-button.html
+++ b/packages/e2e-tests/fixtures/blocks/core__file__no-download-button.html
@@ -1,3 +1,3 @@
-<!-- wp:file {"href":"http://localhost:8888/wp-content/uploads/2018/05/keycodes.js","showDownloadButton":false,"id":176} -->
-<div class="wp-block-file"><a href="http://localhost:8888/?attachment_id=176">lkjfijwef</a></div>
+<!-- wp:file {"href":"http://localhost:8888/wp-content/uploads/2018/05/keycodes.js","showDownloadButton":false} -->
+<div class="wp-block-file"><a href="http://localhost:8888/wp-content/uploads/2018/05/keycodes.js">lkjfijwef</a></div>
 <!-- /wp:file -->
diff --git a/packages/e2e-tests/fixtures/blocks/core__file__no-download-button.json b/packages/e2e-tests/fixtures/blocks/core__file__no-download-button.json
index 44ff5553acbe1a..6b034cf8b9cdb2 100644
--- a/packages/e2e-tests/fixtures/blocks/core__file__no-download-button.json
+++ b/packages/e2e-tests/fixtures/blocks/core__file__no-download-button.json
@@ -4,14 +4,13 @@
         "name": "core/file",
         "isValid": true,
         "attributes": {
-            "id": 176,
             "href": "http://localhost:8888/wp-content/uploads/2018/05/keycodes.js",
             "fileName": "lkjfijwef",
-            "textLinkHref": "http://localhost:8888/?attachment_id=176",
+            "textLinkHref": "http://localhost:8888/wp-content/uploads/2018/05/keycodes.js",
             "showDownloadButton": false,
             "downloadButtonText": ""
         },
         "innerBlocks": [],
-        "originalContent": "<div class=\"wp-block-file\"><a href=\"http://localhost:8888/?attachment_id=176\">lkjfijwef</a></div>"
+        "originalContent": "<div class=\"wp-block-file\"><a href=\"http://localhost:8888/wp-content/uploads/2018/05/keycodes.js\">lkjfijwef</a></div>"
     }
 ]
diff --git a/packages/e2e-tests/fixtures/blocks/core__file__no-download-button.parsed.json b/packages/e2e-tests/fixtures/blocks/core__file__no-download-button.parsed.json
index ac019b969423ca..bf500bf663d40d 100644
--- a/packages/e2e-tests/fixtures/blocks/core__file__no-download-button.parsed.json
+++ b/packages/e2e-tests/fixtures/blocks/core__file__no-download-button.parsed.json
@@ -3,13 +3,12 @@
         "blockName": "core/file",
         "attrs": {
             "href": "http://localhost:8888/wp-content/uploads/2018/05/keycodes.js",
-            "showDownloadButton": false,
-            "id": 176
+            "showDownloadButton": false
         },
         "innerBlocks": [],
-        "innerHTML": "\n<div class=\"wp-block-file\"><a href=\"http://localhost:8888/?attachment_id=176\">lkjfijwef</a></div>\n",
+        "innerHTML": "\n<div class=\"wp-block-file\"><a href=\"http://localhost:8888/wp-content/uploads/2018/05/keycodes.js\">lkjfijwef</a></div>\n",
         "innerContent": [
-            "\n<div class=\"wp-block-file\"><a href=\"http://localhost:8888/?attachment_id=176\">lkjfijwef</a></div>\n"
+            "\n<div class=\"wp-block-file\"><a href=\"http://localhost:8888/wp-content/uploads/2018/05/keycodes.js\">lkjfijwef</a></div>\n"
         ]
     },
     {
diff --git a/packages/e2e-tests/fixtures/blocks/core__file__no-download-button.serialized.html b/packages/e2e-tests/fixtures/blocks/core__file__no-download-button.serialized.html
index 639e3e6c9d8a2e..28574abb0e365d 100644
--- a/packages/e2e-tests/fixtures/blocks/core__file__no-download-button.serialized.html
+++ b/packages/e2e-tests/fixtures/blocks/core__file__no-download-button.serialized.html
@@ -1,3 +1,3 @@
-<!-- wp:file {"id":176,"href":"http://localhost:8888/wp-content/uploads/2018/05/keycodes.js","showDownloadButton":false} -->
-<div class="wp-block-file"><a href="http://localhost:8888/?attachment_id=176">lkjfijwef</a></div>
+<!-- wp:file {"href":"http://localhost:8888/wp-content/uploads/2018/05/keycodes.js","showDownloadButton":false} -->
+<div class="wp-block-file"><a href="http://localhost:8888/wp-content/uploads/2018/05/keycodes.js">lkjfijwef</a></div>
 <!-- /wp:file -->
diff --git a/packages/e2e-tests/fixtures/blocks/core__file__no-text-link.html b/packages/e2e-tests/fixtures/blocks/core__file__no-text-link.html
index 02fd463de11d8f..22bae9ce86a8ab 100644
--- a/packages/e2e-tests/fixtures/blocks/core__file__no-text-link.html
+++ b/packages/e2e-tests/fixtures/blocks/core__file__no-text-link.html
@@ -1,3 +1,3 @@
-<!-- wp:file {"href":"http://localhost:8888/wp-content/uploads/2018/05/keycodes.js","showDownloadButton":true,"id":176} -->
+<!-- wp:file {"href":"http://localhost:8888/wp-content/uploads/2018/05/keycodes.js","showDownloadButton":true} -->
 <div class="wp-block-file"><a href="http://localhost:8888/wp-content/uploads/2018/05/keycodes.js" class="wp-block-file__button" download>Download</a></div>
 <!-- /wp:file -->
diff --git a/packages/e2e-tests/fixtures/blocks/core__file__no-text-link.json b/packages/e2e-tests/fixtures/blocks/core__file__no-text-link.json
index ec3e7b670b8b21..75db9d2bb0f855 100644
--- a/packages/e2e-tests/fixtures/blocks/core__file__no-text-link.json
+++ b/packages/e2e-tests/fixtures/blocks/core__file__no-text-link.json
@@ -4,7 +4,6 @@
         "name": "core/file",
         "isValid": true,
         "attributes": {
-            "id": 176,
             "href": "http://localhost:8888/wp-content/uploads/2018/05/keycodes.js",
             "fileName": "",
             "showDownloadButton": true,
diff --git a/packages/e2e-tests/fixtures/blocks/core__file__no-text-link.parsed.json b/packages/e2e-tests/fixtures/blocks/core__file__no-text-link.parsed.json
index d70321c12c06dd..62bc3d8904098e 100644
--- a/packages/e2e-tests/fixtures/blocks/core__file__no-text-link.parsed.json
+++ b/packages/e2e-tests/fixtures/blocks/core__file__no-text-link.parsed.json
@@ -3,8 +3,7 @@
         "blockName": "core/file",
         "attrs": {
             "href": "http://localhost:8888/wp-content/uploads/2018/05/keycodes.js",
-            "showDownloadButton": true,
-            "id": 176
+            "showDownloadButton": true
         },
         "innerBlocks": [],
         "innerHTML": "\n<div class=\"wp-block-file\"><a href=\"http://localhost:8888/wp-content/uploads/2018/05/keycodes.js\" class=\"wp-block-file__button\" download>Download</a></div>\n",
diff --git a/packages/e2e-tests/fixtures/blocks/core__file__no-text-link.serialized.html b/packages/e2e-tests/fixtures/blocks/core__file__no-text-link.serialized.html
index 1289b3128720d7..b872fd5de21b00 100644
--- a/packages/e2e-tests/fixtures/blocks/core__file__no-text-link.serialized.html
+++ b/packages/e2e-tests/fixtures/blocks/core__file__no-text-link.serialized.html
@@ -1,3 +1,3 @@
-<!-- wp:file {"id":176,"href":"http://localhost:8888/wp-content/uploads/2018/05/keycodes.js"} -->
+<!-- wp:file {"href":"http://localhost:8888/wp-content/uploads/2018/05/keycodes.js"} -->
 <div class="wp-block-file"><a href="http://localhost:8888/wp-content/uploads/2018/05/keycodes.js" class="wp-block-file__button" download>Download</a></div>
 <!-- /wp:file -->
diff --git a/packages/e2e-tests/fixtures/blocks/core__gallery.html b/packages/e2e-tests/fixtures/blocks/core__gallery.html
index a5842fd7dd581b..b91a575be9ca53 100644
--- a/packages/e2e-tests/fixtures/blocks/core__gallery.html
+++ b/packages/e2e-tests/fixtures/blocks/core__gallery.html
@@ -2,12 +2,12 @@
 <ul class="wp-block-gallery columns-2 is-cropped">
 	<li class="blocks-gallery-item">
 		<figure>
-			<img src="https://cldup.com/uuUqE_dXzy.jpg" alt="title" />
+			<img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==" alt="title" />
 		</figure>
 	</li>
 	<li class="blocks-gallery-item">
 		<figure>
-			<img src="http://google.com/hi.png" alt="title" />
+			<img src="data:image/jpeg;base64,/9j/2wBDAAMCAgICAgMCAgIDAwMDBAYEBAQEBAgGBgUGCQgKCgkICQkKDA8MCgsOCwkJDRENDg8QEBEQCgwSExIQEw8QEBD/yQALCAABAAEBAREA/8wABgAQEAX/2gAIAQEAAD8A0s8g/9k=" alt="title" />
 		</figure>
 	</li>
 </ul>
diff --git a/packages/e2e-tests/fixtures/blocks/core__gallery.json b/packages/e2e-tests/fixtures/blocks/core__gallery.json
index 1e87ee42c8702f..4825848d9e6c43 100644
--- a/packages/e2e-tests/fixtures/blocks/core__gallery.json
+++ b/packages/e2e-tests/fixtures/blocks/core__gallery.json
@@ -6,12 +6,12 @@
         "attributes": {
             "images": [
                 {
-                    "url": "https://cldup.com/uuUqE_dXzy.jpg",
+                    "url": "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==",
                     "alt": "title",
                     "caption": ""
                 },
                 {
-                    "url": "http://google.com/hi.png",
+                    "url": "data:image/jpeg;base64,/9j/2wBDAAMCAgICAgMCAgIDAwMDBAYEBAQEBAgGBgUGCQgKCgkICQkKDA8MCgsOCwkJDRENDg8QEBEQCgwSExIQEw8QEBD/yQALCAABAAEBAREA/8wABgAQEAX/2gAIAQEAAD8A0s8g/9k=",
                     "alt": "title",
                     "caption": ""
                 }
@@ -24,6 +24,6 @@
             "linkTo": "none"
         },
         "innerBlocks": [],
-        "originalContent": "<ul class=\"wp-block-gallery columns-2 is-cropped\">\n\t<li class=\"blocks-gallery-item\">\n\t\t<figure>\n\t\t\t<img src=\"https://cldup.com/uuUqE_dXzy.jpg\" alt=\"title\" />\n\t\t</figure>\n\t</li>\n\t<li class=\"blocks-gallery-item\">\n\t\t<figure>\n\t\t\t<img src=\"http://google.com/hi.png\" alt=\"title\" />\n\t\t</figure>\n\t</li>\n</ul>"
+        "originalContent": "<ul class=\"wp-block-gallery columns-2 is-cropped\">\n\t<li class=\"blocks-gallery-item\">\n\t\t<figure>\n\t\t\t<img src=\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==\" alt=\"title\" />\n\t\t</figure>\n\t</li>\n\t<li class=\"blocks-gallery-item\">\n\t\t<figure>\n\t\t\t<img src=\"data:image/jpeg;base64,/9j/2wBDAAMCAgICAgMCAgIDAwMDBAYEBAQEBAgGBgUGCQgKCgkICQkKDA8MCgsOCwkJDRENDg8QEBEQCgwSExIQEw8QEBD/yQALCAABAAEBAREA/8wABgAQEAX/2gAIAQEAAD8A0s8g/9k=\" alt=\"title\" />\n\t\t</figure>\n\t</li>\n</ul>"
     }
 ]
diff --git a/packages/e2e-tests/fixtures/blocks/core__gallery.parsed.json b/packages/e2e-tests/fixtures/blocks/core__gallery.parsed.json
index e070b1f70b5f63..99c1ac20ed9562 100644
--- a/packages/e2e-tests/fixtures/blocks/core__gallery.parsed.json
+++ b/packages/e2e-tests/fixtures/blocks/core__gallery.parsed.json
@@ -8,9 +8,9 @@
             ]
         },
         "innerBlocks": [],
-        "innerHTML": "\n<ul class=\"wp-block-gallery columns-2 is-cropped\">\n\t<li class=\"blocks-gallery-item\">\n\t\t<figure>\n\t\t\t<img src=\"https://cldup.com/uuUqE_dXzy.jpg\" alt=\"title\" />\n\t\t</figure>\n\t</li>\n\t<li class=\"blocks-gallery-item\">\n\t\t<figure>\n\t\t\t<img src=\"http://google.com/hi.png\" alt=\"title\" />\n\t\t</figure>\n\t</li>\n</ul>\n",
+        "innerHTML": "\n<ul class=\"wp-block-gallery columns-2 is-cropped\">\n\t<li class=\"blocks-gallery-item\">\n\t\t<figure>\n\t\t\t<img src=\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==\" alt=\"title\" />\n\t\t</figure>\n\t</li>\n\t<li class=\"blocks-gallery-item\">\n\t\t<figure>\n\t\t\t<img src=\"data:image/jpeg;base64,/9j/2wBDAAMCAgICAgMCAgIDAwMDBAYEBAQEBAgGBgUGCQgKCgkICQkKDA8MCgsOCwkJDRENDg8QEBEQCgwSExIQEw8QEBD/yQALCAABAAEBAREA/8wABgAQEAX/2gAIAQEAAD8A0s8g/9k=\" alt=\"title\" />\n\t\t</figure>\n\t</li>\n</ul>\n",
         "innerContent": [
-            "\n<ul class=\"wp-block-gallery columns-2 is-cropped\">\n\t<li class=\"blocks-gallery-item\">\n\t\t<figure>\n\t\t\t<img src=\"https://cldup.com/uuUqE_dXzy.jpg\" alt=\"title\" />\n\t\t</figure>\n\t</li>\n\t<li class=\"blocks-gallery-item\">\n\t\t<figure>\n\t\t\t<img src=\"http://google.com/hi.png\" alt=\"title\" />\n\t\t</figure>\n\t</li>\n</ul>\n"
+            "\n<ul class=\"wp-block-gallery columns-2 is-cropped\">\n\t<li class=\"blocks-gallery-item\">\n\t\t<figure>\n\t\t\t<img src=\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==\" alt=\"title\" />\n\t\t</figure>\n\t</li>\n\t<li class=\"blocks-gallery-item\">\n\t\t<figure>\n\t\t\t<img src=\"data:image/jpeg;base64,/9j/2wBDAAMCAgICAgMCAgIDAwMDBAYEBAQEBAgGBgUGCQgKCgkICQkKDA8MCgsOCwkJDRENDg8QEBEQCgwSExIQEw8QEBD/yQALCAABAAEBAREA/8wABgAQEAX/2gAIAQEAAD8A0s8g/9k=\" alt=\"title\" />\n\t\t</figure>\n\t</li>\n</ul>\n"
         ]
     },
     {
diff --git a/packages/e2e-tests/fixtures/blocks/core__gallery.serialized.html b/packages/e2e-tests/fixtures/blocks/core__gallery.serialized.html
index 55a1e6bab03770..813f97c645287e 100644
--- a/packages/e2e-tests/fixtures/blocks/core__gallery.serialized.html
+++ b/packages/e2e-tests/fixtures/blocks/core__gallery.serialized.html
@@ -1,3 +1,3 @@
 <!-- wp:gallery {"ids":[null,null]} -->
-<ul class="wp-block-gallery columns-2 is-cropped"><li class="blocks-gallery-item"><figure><img src="https://cldup.com/uuUqE_dXzy.jpg" alt="title"/></figure></li><li class="blocks-gallery-item"><figure><img src="http://google.com/hi.png" alt="title"/></figure></li></ul>
+<ul class="wp-block-gallery columns-2 is-cropped"><li class="blocks-gallery-item"><figure><img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==" alt="title"/></figure></li><li class="blocks-gallery-item"><figure><img src="data:image/jpeg;base64,/9j/2wBDAAMCAgICAgMCAgIDAwMDBAYEBAQEBAgGBgUGCQgKCgkICQkKDA8MCgsOCwkJDRENDg8QEBEQCgwSExIQEw8QEBD/yQALCAABAAEBAREA/8wABgAQEAX/2gAIAQEAAD8A0s8g/9k=" alt="title"/></figure></li></ul>
 <!-- /wp:gallery -->
diff --git a/packages/e2e-tests/fixtures/blocks/core__gallery__columns.html b/packages/e2e-tests/fixtures/blocks/core__gallery__columns.html
index 6493c70309dad2..e97f7b9f87f3cb 100644
--- a/packages/e2e-tests/fixtures/blocks/core__gallery__columns.html
+++ b/packages/e2e-tests/fixtures/blocks/core__gallery__columns.html
@@ -2,12 +2,12 @@
 <ul class="wp-block-gallery columns-1 is-cropped">
 	<li class="blocks-gallery-item">
 		<figure>
-			<img src="https://cldup.com/uuUqE_dXzy.jpg" alt="title" />
+			<img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==" alt="title" />
 		</figure>
 	</li>
 	<li class="blocks-gallery-item">
 		<figure>
-			<img src="http://google.com/hi.png" alt="title" />
+			<img src="data:image/jpeg;base64,/9j/2wBDAAMCAgICAgMCAgIDAwMDBAYEBAQEBAgGBgUGCQgKCgkICQkKDA8MCgsOCwkJDRENDg8QEBEQCgwSExIQEw8QEBD/yQALCAABAAEBAREA/8wABgAQEAX/2gAIAQEAAD8A0s8g/9k=" alt="title" />
 		</figure>
 	</li>
 </ul>
diff --git a/packages/e2e-tests/fixtures/blocks/core__gallery__columns.json b/packages/e2e-tests/fixtures/blocks/core__gallery__columns.json
index d96473e9d8d041..f149e3faf630a4 100644
--- a/packages/e2e-tests/fixtures/blocks/core__gallery__columns.json
+++ b/packages/e2e-tests/fixtures/blocks/core__gallery__columns.json
@@ -6,12 +6,12 @@
         "attributes": {
             "images": [
                 {
-                    "url": "https://cldup.com/uuUqE_dXzy.jpg",
+                    "url": "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==",
                     "alt": "title",
                     "caption": ""
                 },
                 {
-                    "url": "http://google.com/hi.png",
+                    "url": "data:image/jpeg;base64,/9j/2wBDAAMCAgICAgMCAgIDAwMDBAYEBAQEBAgGBgUGCQgKCgkICQkKDA8MCgsOCwkJDRENDg8QEBEQCgwSExIQEw8QEBD/yQALCAABAAEBAREA/8wABgAQEAX/2gAIAQEAAD8A0s8g/9k=",
                     "alt": "title",
                     "caption": ""
                 }
@@ -25,6 +25,6 @@
             "linkTo": "none"
         },
         "innerBlocks": [],
-        "originalContent": "<ul class=\"wp-block-gallery columns-1 is-cropped\">\n\t<li class=\"blocks-gallery-item\">\n\t\t<figure>\n\t\t\t<img src=\"https://cldup.com/uuUqE_dXzy.jpg\" alt=\"title\" />\n\t\t</figure>\n\t</li>\n\t<li class=\"blocks-gallery-item\">\n\t\t<figure>\n\t\t\t<img src=\"http://google.com/hi.png\" alt=\"title\" />\n\t\t</figure>\n\t</li>\n</ul>"
+        "originalContent": "<ul class=\"wp-block-gallery columns-1 is-cropped\">\n\t<li class=\"blocks-gallery-item\">\n\t\t<figure>\n\t\t\t<img src=\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==\" alt=\"title\" />\n\t\t</figure>\n\t</li>\n\t<li class=\"blocks-gallery-item\">\n\t\t<figure>\n\t\t\t<img src=\"data:image/jpeg;base64,/9j/2wBDAAMCAgICAgMCAgIDAwMDBAYEBAQEBAgGBgUGCQgKCgkICQkKDA8MCgsOCwkJDRENDg8QEBEQCgwSExIQEw8QEBD/yQALCAABAAEBAREA/8wABgAQEAX/2gAIAQEAAD8A0s8g/9k=\" alt=\"title\" />\n\t\t</figure>\n\t</li>\n</ul>"
     }
 ]
diff --git a/packages/e2e-tests/fixtures/blocks/core__gallery__columns.parsed.json b/packages/e2e-tests/fixtures/blocks/core__gallery__columns.parsed.json
index 6a2b71ac242f19..14a5b12897804f 100644
--- a/packages/e2e-tests/fixtures/blocks/core__gallery__columns.parsed.json
+++ b/packages/e2e-tests/fixtures/blocks/core__gallery__columns.parsed.json
@@ -9,9 +9,9 @@
             "columns": 1
         },
         "innerBlocks": [],
-        "innerHTML": "\n<ul class=\"wp-block-gallery columns-1 is-cropped\">\n\t<li class=\"blocks-gallery-item\">\n\t\t<figure>\n\t\t\t<img src=\"https://cldup.com/uuUqE_dXzy.jpg\" alt=\"title\" />\n\t\t</figure>\n\t</li>\n\t<li class=\"blocks-gallery-item\">\n\t\t<figure>\n\t\t\t<img src=\"http://google.com/hi.png\" alt=\"title\" />\n\t\t</figure>\n\t</li>\n</ul>\n",
+        "innerHTML": "\n<ul class=\"wp-block-gallery columns-1 is-cropped\">\n\t<li class=\"blocks-gallery-item\">\n\t\t<figure>\n\t\t\t<img src=\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==\" alt=\"title\" />\n\t\t</figure>\n\t</li>\n\t<li class=\"blocks-gallery-item\">\n\t\t<figure>\n\t\t\t<img src=\"data:image/jpeg;base64,/9j/2wBDAAMCAgICAgMCAgIDAwMDBAYEBAQEBAgGBgUGCQgKCgkICQkKDA8MCgsOCwkJDRENDg8QEBEQCgwSExIQEw8QEBD/yQALCAABAAEBAREA/8wABgAQEAX/2gAIAQEAAD8A0s8g/9k=\" alt=\"title\" />\n\t\t</figure>\n\t</li>\n</ul>\n",
         "innerContent": [
-            "\n<ul class=\"wp-block-gallery columns-1 is-cropped\">\n\t<li class=\"blocks-gallery-item\">\n\t\t<figure>\n\t\t\t<img src=\"https://cldup.com/uuUqE_dXzy.jpg\" alt=\"title\" />\n\t\t</figure>\n\t</li>\n\t<li class=\"blocks-gallery-item\">\n\t\t<figure>\n\t\t\t<img src=\"http://google.com/hi.png\" alt=\"title\" />\n\t\t</figure>\n\t</li>\n</ul>\n"
+            "\n<ul class=\"wp-block-gallery columns-1 is-cropped\">\n\t<li class=\"blocks-gallery-item\">\n\t\t<figure>\n\t\t\t<img src=\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==\" alt=\"title\" />\n\t\t</figure>\n\t</li>\n\t<li class=\"blocks-gallery-item\">\n\t\t<figure>\n\t\t\t<img src=\"data:image/jpeg;base64,/9j/2wBDAAMCAgICAgMCAgIDAwMDBAYEBAQEBAgGBgUGCQgKCgkICQkKDA8MCgsOCwkJDRENDg8QEBEQCgwSExIQEw8QEBD/yQALCAABAAEBAREA/8wABgAQEAX/2gAIAQEAAD8A0s8g/9k=\" alt=\"title\" />\n\t\t</figure>\n\t</li>\n</ul>\n"
         ]
     },
     {
diff --git a/packages/e2e-tests/fixtures/blocks/core__gallery__columns.serialized.html b/packages/e2e-tests/fixtures/blocks/core__gallery__columns.serialized.html
index 7c5c369cc4199b..cb2b112acad9e3 100644
--- a/packages/e2e-tests/fixtures/blocks/core__gallery__columns.serialized.html
+++ b/packages/e2e-tests/fixtures/blocks/core__gallery__columns.serialized.html
@@ -1,3 +1,3 @@
 <!-- wp:gallery {"ids":[null,null],"columns":1} -->
-<ul class="wp-block-gallery columns-1 is-cropped"><li class="blocks-gallery-item"><figure><img src="https://cldup.com/uuUqE_dXzy.jpg" alt="title"/></figure></li><li class="blocks-gallery-item"><figure><img src="http://google.com/hi.png" alt="title"/></figure></li></ul>
+<ul class="wp-block-gallery columns-1 is-cropped"><li class="blocks-gallery-item"><figure><img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==" alt="title"/></figure></li><li class="blocks-gallery-item"><figure><img src="data:image/jpeg;base64,/9j/2wBDAAMCAgICAgMCAgIDAwMDBAYEBAQEBAgGBgUGCQgKCgkICQkKDA8MCgsOCwkJDRENDg8QEBEQCgwSExIQEw8QEBD/yQALCAABAAEBAREA/8wABgAQEAX/2gAIAQEAAD8A0s8g/9k=" alt="title"/></figure></li></ul>
 <!-- /wp:gallery -->
diff --git a/packages/e2e-tests/fixtures/blocks/core__image.html b/packages/e2e-tests/fixtures/blocks/core__image.html
index eda663561a38bf..a4385309da7a45 100644
--- a/packages/e2e-tests/fixtures/blocks/core__image.html
+++ b/packages/e2e-tests/fixtures/blocks/core__image.html
@@ -1,3 +1,3 @@
 <!-- wp:core/image -->
-<figure class="wp-block-image"><img src="https://cldup.com/uuUqE_dXzy.jpg" alt="" /></figure>
+<figure class="wp-block-image"><img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==" alt="" /></figure>
 <!-- /wp:core/image -->
diff --git a/packages/e2e-tests/fixtures/blocks/core__image.json b/packages/e2e-tests/fixtures/blocks/core__image.json
index 4369150f0c9292..22c56bcf681315 100644
--- a/packages/e2e-tests/fixtures/blocks/core__image.json
+++ b/packages/e2e-tests/fixtures/blocks/core__image.json
@@ -4,12 +4,12 @@
         "name": "core/image",
         "isValid": true,
         "attributes": {
-            "url": "https://cldup.com/uuUqE_dXzy.jpg",
+            "url": "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==",
             "alt": "",
             "caption": "",
             "linkDestination": "none"
         },
         "innerBlocks": [],
-        "originalContent": "<figure class=\"wp-block-image\"><img src=\"https://cldup.com/uuUqE_dXzy.jpg\" alt=\"\" /></figure>"
+        "originalContent": "<figure class=\"wp-block-image\"><img src=\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==\" alt=\"\" /></figure>"
     }
 ]
diff --git a/packages/e2e-tests/fixtures/blocks/core__image.parsed.json b/packages/e2e-tests/fixtures/blocks/core__image.parsed.json
index d7e16a440ddefb..37fc14fff50756 100644
--- a/packages/e2e-tests/fixtures/blocks/core__image.parsed.json
+++ b/packages/e2e-tests/fixtures/blocks/core__image.parsed.json
@@ -3,9 +3,9 @@
         "blockName": "core/image",
         "attrs": {},
         "innerBlocks": [],
-        "innerHTML": "\n<figure class=\"wp-block-image\"><img src=\"https://cldup.com/uuUqE_dXzy.jpg\" alt=\"\" /></figure>\n",
+        "innerHTML": "\n<figure class=\"wp-block-image\"><img src=\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==\" alt=\"\" /></figure>\n",
         "innerContent": [
-            "\n<figure class=\"wp-block-image\"><img src=\"https://cldup.com/uuUqE_dXzy.jpg\" alt=\"\" /></figure>\n"
+            "\n<figure class=\"wp-block-image\"><img src=\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==\" alt=\"\" /></figure>\n"
         ]
     },
     {
diff --git a/packages/e2e-tests/fixtures/blocks/core__image.serialized.html b/packages/e2e-tests/fixtures/blocks/core__image.serialized.html
index 5dfb0bac3e5b72..d6fe6d2d99a046 100644
--- a/packages/e2e-tests/fixtures/blocks/core__image.serialized.html
+++ b/packages/e2e-tests/fixtures/blocks/core__image.serialized.html
@@ -1,3 +1,3 @@
 <!-- wp:image -->
-<figure class="wp-block-image"><img src="https://cldup.com/uuUqE_dXzy.jpg" alt=""/></figure>
+<figure class="wp-block-image"><img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==" alt=""/></figure>
 <!-- /wp:image -->
diff --git a/packages/e2e-tests/fixtures/blocks/core__image__attachment-link.html b/packages/e2e-tests/fixtures/blocks/core__image__attachment-link.html
index 908250d8ca249c..5a684ff99083bc 100644
--- a/packages/e2e-tests/fixtures/blocks/core__image__attachment-link.html
+++ b/packages/e2e-tests/fixtures/blocks/core__image__attachment-link.html
@@ -1,3 +1,3 @@
 <!-- wp:core/image {"linkDestination":"attachment"}  -->
-<figure class="wp-block-image"><a href="http://localhost:8888/?attachment_id=7"><img src="https://cldup.com/uuUqE_dXzy.jpg" alt="" /></a></figure>
+<figure class="wp-block-image"><a href="http://localhost:8888/?attachment_id=7"><img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==" alt="" /></a></figure>
 <!-- /wp:core/image -->
diff --git a/packages/e2e-tests/fixtures/blocks/core__image__attachment-link.json b/packages/e2e-tests/fixtures/blocks/core__image__attachment-link.json
index 5d169589043a5c..9a82085c205eed 100644
--- a/packages/e2e-tests/fixtures/blocks/core__image__attachment-link.json
+++ b/packages/e2e-tests/fixtures/blocks/core__image__attachment-link.json
@@ -4,13 +4,13 @@
         "name": "core/image",
         "isValid": true,
         "attributes": {
-            "url": "https://cldup.com/uuUqE_dXzy.jpg",
+            "url": "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==",
             "alt": "",
             "caption": "",
             "href": "http://localhost:8888/?attachment_id=7",
             "linkDestination": "attachment"
         },
         "innerBlocks": [],
-        "originalContent": "<figure class=\"wp-block-image\"><a href=\"http://localhost:8888/?attachment_id=7\"><img src=\"https://cldup.com/uuUqE_dXzy.jpg\" alt=\"\" /></a></figure>"
+        "originalContent": "<figure class=\"wp-block-image\"><a href=\"http://localhost:8888/?attachment_id=7\"><img src=\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==\" alt=\"\" /></a></figure>"
     }
 ]
diff --git a/packages/e2e-tests/fixtures/blocks/core__image__attachment-link.parsed.json b/packages/e2e-tests/fixtures/blocks/core__image__attachment-link.parsed.json
index fae6604516028e..26278ee5b85a1d 100644
--- a/packages/e2e-tests/fixtures/blocks/core__image__attachment-link.parsed.json
+++ b/packages/e2e-tests/fixtures/blocks/core__image__attachment-link.parsed.json
@@ -5,9 +5,9 @@
             "linkDestination": "attachment"
         },
         "innerBlocks": [],
-        "innerHTML": "\n<figure class=\"wp-block-image\"><a href=\"http://localhost:8888/?attachment_id=7\"><img src=\"https://cldup.com/uuUqE_dXzy.jpg\" alt=\"\" /></a></figure>\n",
+        "innerHTML": "\n<figure class=\"wp-block-image\"><a href=\"http://localhost:8888/?attachment_id=7\"><img src=\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==\" alt=\"\" /></a></figure>\n",
         "innerContent": [
-            "\n<figure class=\"wp-block-image\"><a href=\"http://localhost:8888/?attachment_id=7\"><img src=\"https://cldup.com/uuUqE_dXzy.jpg\" alt=\"\" /></a></figure>\n"
+            "\n<figure class=\"wp-block-image\"><a href=\"http://localhost:8888/?attachment_id=7\"><img src=\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==\" alt=\"\" /></a></figure>\n"
         ]
     },
     {
diff --git a/packages/e2e-tests/fixtures/blocks/core__image__attachment-link.serialized.html b/packages/e2e-tests/fixtures/blocks/core__image__attachment-link.serialized.html
index f5ebb9af4182c5..3f74e96cbcb277 100644
--- a/packages/e2e-tests/fixtures/blocks/core__image__attachment-link.serialized.html
+++ b/packages/e2e-tests/fixtures/blocks/core__image__attachment-link.serialized.html
@@ -1,3 +1,3 @@
 <!-- wp:image {"linkDestination":"attachment"} -->
-<figure class="wp-block-image"><a href="http://localhost:8888/?attachment_id=7"><img src="https://cldup.com/uuUqE_dXzy.jpg" alt=""/></a></figure>
+<figure class="wp-block-image"><a href="http://localhost:8888/?attachment_id=7"><img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==" alt=""/></a></figure>
 <!-- /wp:image -->
diff --git a/packages/e2e-tests/fixtures/blocks/core__image__center-caption.html b/packages/e2e-tests/fixtures/blocks/core__image__center-caption.html
index bfe40d190fa66e..1f5d724f5498ec 100644
--- a/packages/e2e-tests/fixtures/blocks/core__image__center-caption.html
+++ b/packages/e2e-tests/fixtures/blocks/core__image__center-caption.html
@@ -1,3 +1,3 @@
 <!-- wp:core/image {"align":"center"} -->
-<div class="wp-block-image"><figure class="aligncenter"><img src="https://cldup.com/YLYhpou2oq.jpg" alt="" /><figcaption>Give it a try. Press the &quot;really wide&quot; button on the image toolbar.</figcaption></figure></div>
+<div class="wp-block-image"><figure class="aligncenter"><img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==" alt="" /><figcaption>Give it a try. Press the &quot;really wide&quot; button on the image toolbar.</figcaption></figure></div>
 <!-- /wp:core/image -->
diff --git a/packages/e2e-tests/fixtures/blocks/core__image__center-caption.json b/packages/e2e-tests/fixtures/blocks/core__image__center-caption.json
index f569bda22c81b2..525502f15232e9 100644
--- a/packages/e2e-tests/fixtures/blocks/core__image__center-caption.json
+++ b/packages/e2e-tests/fixtures/blocks/core__image__center-caption.json
@@ -4,13 +4,13 @@
         "name": "core/image",
         "isValid": true,
         "attributes": {
-            "url": "https://cldup.com/YLYhpou2oq.jpg",
+            "url": "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==",
             "alt": "",
             "caption": "Give it a try. Press the \"really wide\" button on the image toolbar.",
             "align": "center",
             "linkDestination": "none"
         },
         "innerBlocks": [],
-        "originalContent": "<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img src=\"https://cldup.com/YLYhpou2oq.jpg\" alt=\"\" /><figcaption>Give it a try. Press the &quot;really wide&quot; button on the image toolbar.</figcaption></figure></div>"
+        "originalContent": "<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img src=\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==\" alt=\"\" /><figcaption>Give it a try. Press the &quot;really wide&quot; button on the image toolbar.</figcaption></figure></div>"
     }
 ]
diff --git a/packages/e2e-tests/fixtures/blocks/core__image__center-caption.parsed.json b/packages/e2e-tests/fixtures/blocks/core__image__center-caption.parsed.json
index 02ff95e3ae8cb7..f7b2a79de72144 100644
--- a/packages/e2e-tests/fixtures/blocks/core__image__center-caption.parsed.json
+++ b/packages/e2e-tests/fixtures/blocks/core__image__center-caption.parsed.json
@@ -5,9 +5,9 @@
             "align": "center"
         },
         "innerBlocks": [],
-        "innerHTML": "\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img src=\"https://cldup.com/YLYhpou2oq.jpg\" alt=\"\" /><figcaption>Give it a try. Press the &quot;really wide&quot; button on the image toolbar.</figcaption></figure></div>\n",
+        "innerHTML": "\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img src=\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==\" alt=\"\" /><figcaption>Give it a try. Press the &quot;really wide&quot; button on the image toolbar.</figcaption></figure></div>\n",
         "innerContent": [
-            "\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img src=\"https://cldup.com/YLYhpou2oq.jpg\" alt=\"\" /><figcaption>Give it a try. Press the &quot;really wide&quot; button on the image toolbar.</figcaption></figure></div>\n"
+            "\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img src=\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==\" alt=\"\" /><figcaption>Give it a try. Press the &quot;really wide&quot; button on the image toolbar.</figcaption></figure></div>\n"
         ]
     },
     {
diff --git a/packages/e2e-tests/fixtures/blocks/core__image__center-caption.serialized.html b/packages/e2e-tests/fixtures/blocks/core__image__center-caption.serialized.html
index 3410b04fdf1214..fe1a5c2b03a13c 100644
--- a/packages/e2e-tests/fixtures/blocks/core__image__center-caption.serialized.html
+++ b/packages/e2e-tests/fixtures/blocks/core__image__center-caption.serialized.html
@@ -1,3 +1,3 @@
 <!-- wp:image {"align":"center"} -->
-<div class="wp-block-image"><figure class="aligncenter"><img src="https://cldup.com/YLYhpou2oq.jpg" alt=""/><figcaption>Give it a try. Press the "really wide" button on the image toolbar.</figcaption></figure></div>
+<div class="wp-block-image"><figure class="aligncenter"><img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==" alt=""/><figcaption>Give it a try. Press the "really wide" button on the image toolbar.</figcaption></figure></div>
 <!-- /wp:image -->
diff --git a/packages/e2e-tests/fixtures/blocks/core__image__custom-link-class.html b/packages/e2e-tests/fixtures/blocks/core__image__custom-link-class.html
index 57cc46c9c39bbe..18201cdd3b1056 100644
--- a/packages/e2e-tests/fixtures/blocks/core__image__custom-link-class.html
+++ b/packages/e2e-tests/fixtures/blocks/core__image__custom-link-class.html
@@ -1,3 +1,3 @@
 <!-- wp:core/image {"linkDestination":"custom"}  -->
-<figure class="wp-block-image"><a class="custom-link" href="https://wordpress.org/"><img src="https://cldup.com/uuUqE_dXzy.jpg" alt="" /></a></figure>
+<figure class="wp-block-image"><a class="custom-link" href="https://wordpress.org/"><img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==" alt="" /></a></figure>
 <!-- /wp:core/image -->
diff --git a/packages/e2e-tests/fixtures/blocks/core__image__custom-link-class.json b/packages/e2e-tests/fixtures/blocks/core__image__custom-link-class.json
index d47fe4162c9c62..173999d24f169a 100644
--- a/packages/e2e-tests/fixtures/blocks/core__image__custom-link-class.json
+++ b/packages/e2e-tests/fixtures/blocks/core__image__custom-link-class.json
@@ -4,7 +4,7 @@
         "name": "core/image",
         "isValid": true,
         "attributes": {
-            "url": "https://cldup.com/uuUqE_dXzy.jpg",
+            "url": "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==",
             "alt": "",
             "caption": "",
             "href": "https://wordpress.org/",
@@ -12,6 +12,6 @@
             "linkDestination": "custom"
         },
         "innerBlocks": [],
-        "originalContent": "<figure class=\"wp-block-image\"><a class=\"custom-link\" href=\"https://wordpress.org/\"><img src=\"https://cldup.com/uuUqE_dXzy.jpg\" alt=\"\" /></a></figure>"
+        "originalContent": "<figure class=\"wp-block-image\"><a class=\"custom-link\" href=\"https://wordpress.org/\"><img src=\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==\" alt=\"\" /></a></figure>"
     }
 ]
diff --git a/packages/e2e-tests/fixtures/blocks/core__image__custom-link-class.parsed.json b/packages/e2e-tests/fixtures/blocks/core__image__custom-link-class.parsed.json
index c69b53dcc08aa9..0d8664f1e15489 100644
--- a/packages/e2e-tests/fixtures/blocks/core__image__custom-link-class.parsed.json
+++ b/packages/e2e-tests/fixtures/blocks/core__image__custom-link-class.parsed.json
@@ -5,9 +5,9 @@
             "linkDestination": "custom"
         },
         "innerBlocks": [],
-        "innerHTML": "\n<figure class=\"wp-block-image\"><a class=\"custom-link\" href=\"https://wordpress.org/\"><img src=\"https://cldup.com/uuUqE_dXzy.jpg\" alt=\"\" /></a></figure>\n",
+        "innerHTML": "\n<figure class=\"wp-block-image\"><a class=\"custom-link\" href=\"https://wordpress.org/\"><img src=\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==\" alt=\"\" /></a></figure>\n",
         "innerContent": [
-            "\n<figure class=\"wp-block-image\"><a class=\"custom-link\" href=\"https://wordpress.org/\"><img src=\"https://cldup.com/uuUqE_dXzy.jpg\" alt=\"\" /></a></figure>\n"
+            "\n<figure class=\"wp-block-image\"><a class=\"custom-link\" href=\"https://wordpress.org/\"><img src=\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==\" alt=\"\" /></a></figure>\n"
         ]
     },
     {
diff --git a/packages/e2e-tests/fixtures/blocks/core__image__custom-link-class.serialized.html b/packages/e2e-tests/fixtures/blocks/core__image__custom-link-class.serialized.html
index 9ac1f7a7a914e9..42addd52db7722 100644
--- a/packages/e2e-tests/fixtures/blocks/core__image__custom-link-class.serialized.html
+++ b/packages/e2e-tests/fixtures/blocks/core__image__custom-link-class.serialized.html
@@ -1,3 +1,3 @@
 <!-- wp:image {"linkDestination":"custom"} -->
-<figure class="wp-block-image"><a class="custom-link" href="https://wordpress.org/"><img src="https://cldup.com/uuUqE_dXzy.jpg" alt=""/></a></figure>
+<figure class="wp-block-image"><a class="custom-link" href="https://wordpress.org/"><img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==" alt=""/></a></figure>
 <!-- /wp:image -->
diff --git a/packages/e2e-tests/fixtures/blocks/core__image__custom-link-rel.html b/packages/e2e-tests/fixtures/blocks/core__image__custom-link-rel.html
index 3424ed3fff3d70..97761d08043a43 100644
--- a/packages/e2e-tests/fixtures/blocks/core__image__custom-link-rel.html
+++ b/packages/e2e-tests/fixtures/blocks/core__image__custom-link-rel.html
@@ -1,3 +1,3 @@
 <!-- wp:core/image {"linkDestination":"custom"}  -->
-<figure class="wp-block-image"><a href="https://wordpress.org/" rel="external"><img src="https://cldup.com/uuUqE_dXzy.jpg" alt="" /></a></figure>
+<figure class="wp-block-image"><a href="https://wordpress.org/" rel="external"><img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==" alt="" /></a></figure>
 <!-- /wp:core/image -->
diff --git a/packages/e2e-tests/fixtures/blocks/core__image__custom-link-rel.json b/packages/e2e-tests/fixtures/blocks/core__image__custom-link-rel.json
index 6000da69608e62..c877e3cc5e4bd2 100644
--- a/packages/e2e-tests/fixtures/blocks/core__image__custom-link-rel.json
+++ b/packages/e2e-tests/fixtures/blocks/core__image__custom-link-rel.json
@@ -4,7 +4,7 @@
         "name": "core/image",
         "isValid": true,
         "attributes": {
-            "url": "https://cldup.com/uuUqE_dXzy.jpg",
+            "url": "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==",
             "alt": "",
             "caption": "",
             "href": "https://wordpress.org/",
@@ -12,6 +12,6 @@
             "linkDestination": "custom"
         },
         "innerBlocks": [],
-        "originalContent": "<figure class=\"wp-block-image\"><a href=\"https://wordpress.org/\" rel=\"external\"><img src=\"https://cldup.com/uuUqE_dXzy.jpg\" alt=\"\" /></a></figure>"
+        "originalContent": "<figure class=\"wp-block-image\"><a href=\"https://wordpress.org/\" rel=\"external\"><img src=\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==\" alt=\"\" /></a></figure>"
     }
 ]
diff --git a/packages/e2e-tests/fixtures/blocks/core__image__custom-link-rel.parsed.json b/packages/e2e-tests/fixtures/blocks/core__image__custom-link-rel.parsed.json
index 91649db09a595f..7fa19efad7f21f 100644
--- a/packages/e2e-tests/fixtures/blocks/core__image__custom-link-rel.parsed.json
+++ b/packages/e2e-tests/fixtures/blocks/core__image__custom-link-rel.parsed.json
@@ -5,9 +5,9 @@
             "linkDestination": "custom"
         },
         "innerBlocks": [],
-        "innerHTML": "\n<figure class=\"wp-block-image\"><a href=\"https://wordpress.org/\" rel=\"external\"><img src=\"https://cldup.com/uuUqE_dXzy.jpg\" alt=\"\" /></a></figure>\n",
+        "innerHTML": "\n<figure class=\"wp-block-image\"><a href=\"https://wordpress.org/\" rel=\"external\"><img src=\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==\" alt=\"\" /></a></figure>\n",
         "innerContent": [
-            "\n<figure class=\"wp-block-image\"><a href=\"https://wordpress.org/\" rel=\"external\"><img src=\"https://cldup.com/uuUqE_dXzy.jpg\" alt=\"\" /></a></figure>\n"
+            "\n<figure class=\"wp-block-image\"><a href=\"https://wordpress.org/\" rel=\"external\"><img src=\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==\" alt=\"\" /></a></figure>\n"
         ]
     },
     {
diff --git a/packages/e2e-tests/fixtures/blocks/core__image__custom-link-rel.serialized.html b/packages/e2e-tests/fixtures/blocks/core__image__custom-link-rel.serialized.html
index 92702548c11d9d..13d5d132df4900 100644
--- a/packages/e2e-tests/fixtures/blocks/core__image__custom-link-rel.serialized.html
+++ b/packages/e2e-tests/fixtures/blocks/core__image__custom-link-rel.serialized.html
@@ -1,3 +1,3 @@
 <!-- wp:image {"linkDestination":"custom"} -->
-<figure class="wp-block-image"><a href="https://wordpress.org/" rel="external"><img src="https://cldup.com/uuUqE_dXzy.jpg" alt=""/></a></figure>
+<figure class="wp-block-image"><a href="https://wordpress.org/" rel="external"><img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==" alt=""/></a></figure>
 <!-- /wp:image -->
diff --git a/packages/e2e-tests/fixtures/blocks/core__image__custom-link.html b/packages/e2e-tests/fixtures/blocks/core__image__custom-link.html
index 353dc5376b7a46..e3c4630e53e369 100644
--- a/packages/e2e-tests/fixtures/blocks/core__image__custom-link.html
+++ b/packages/e2e-tests/fixtures/blocks/core__image__custom-link.html
@@ -1,3 +1,3 @@
 <!-- wp:core/image {"linkDestination":"custom"}  -->
-<figure class="wp-block-image"><a href="https://wordpress.org/"><img src="https://cldup.com/uuUqE_dXzy.jpg" alt="" /></a></figure>
+<figure class="wp-block-image"><a href="https://wordpress.org/"><img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==" alt="" /></a></figure>
 <!-- /wp:core/image -->
diff --git a/packages/e2e-tests/fixtures/blocks/core__image__custom-link.json b/packages/e2e-tests/fixtures/blocks/core__image__custom-link.json
index 735e5522826624..58ac7320330cf2 100644
--- a/packages/e2e-tests/fixtures/blocks/core__image__custom-link.json
+++ b/packages/e2e-tests/fixtures/blocks/core__image__custom-link.json
@@ -4,13 +4,13 @@
         "name": "core/image",
         "isValid": true,
         "attributes": {
-            "url": "https://cldup.com/uuUqE_dXzy.jpg",
+            "url": "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==",
             "alt": "",
             "caption": "",
             "href": "https://wordpress.org/",
             "linkDestination": "custom"
         },
         "innerBlocks": [],
-        "originalContent": "<figure class=\"wp-block-image\"><a href=\"https://wordpress.org/\"><img src=\"https://cldup.com/uuUqE_dXzy.jpg\" alt=\"\" /></a></figure>"
+        "originalContent": "<figure class=\"wp-block-image\"><a href=\"https://wordpress.org/\"><img src=\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==\" alt=\"\" /></a></figure>"
     }
 ]
diff --git a/packages/e2e-tests/fixtures/blocks/core__image__custom-link.parsed.json b/packages/e2e-tests/fixtures/blocks/core__image__custom-link.parsed.json
index a3625c6a1f683e..7817fc00fdeaf2 100644
--- a/packages/e2e-tests/fixtures/blocks/core__image__custom-link.parsed.json
+++ b/packages/e2e-tests/fixtures/blocks/core__image__custom-link.parsed.json
@@ -5,9 +5,9 @@
             "linkDestination": "custom"
         },
         "innerBlocks": [],
-        "innerHTML": "\n<figure class=\"wp-block-image\"><a href=\"https://wordpress.org/\"><img src=\"https://cldup.com/uuUqE_dXzy.jpg\" alt=\"\" /></a></figure>\n",
+        "innerHTML": "\n<figure class=\"wp-block-image\"><a href=\"https://wordpress.org/\"><img src=\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==\" alt=\"\" /></a></figure>\n",
         "innerContent": [
-            "\n<figure class=\"wp-block-image\"><a href=\"https://wordpress.org/\"><img src=\"https://cldup.com/uuUqE_dXzy.jpg\" alt=\"\" /></a></figure>\n"
+            "\n<figure class=\"wp-block-image\"><a href=\"https://wordpress.org/\"><img src=\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==\" alt=\"\" /></a></figure>\n"
         ]
     },
     {
diff --git a/packages/e2e-tests/fixtures/blocks/core__image__custom-link.serialized.html b/packages/e2e-tests/fixtures/blocks/core__image__custom-link.serialized.html
index 47357bea6b9d48..27dc6f69f23ca3 100644
--- a/packages/e2e-tests/fixtures/blocks/core__image__custom-link.serialized.html
+++ b/packages/e2e-tests/fixtures/blocks/core__image__custom-link.serialized.html
@@ -1,3 +1,3 @@
 <!-- wp:image {"linkDestination":"custom"} -->
-<figure class="wp-block-image"><a href="https://wordpress.org/"><img src="https://cldup.com/uuUqE_dXzy.jpg" alt=""/></a></figure>
+<figure class="wp-block-image"><a href="https://wordpress.org/"><img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==" alt=""/></a></figure>
 <!-- /wp:image -->
diff --git a/packages/e2e-tests/fixtures/blocks/core__image__media-link.html b/packages/e2e-tests/fixtures/blocks/core__image__media-link.html
index 90b3d227117b04..2afbd21f98c5d6 100644
--- a/packages/e2e-tests/fixtures/blocks/core__image__media-link.html
+++ b/packages/e2e-tests/fixtures/blocks/core__image__media-link.html
@@ -1,3 +1,3 @@
 <!-- wp:core/image {"linkDestination":"media"}  -->
-<figure class="wp-block-image"><a href="https://cldup.com/uuUqE_dXzy.jpg"><img src="https://cldup.com/uuUqE_dXzy.jpg" alt="" /></a></figure>
+<figure class="wp-block-image"><a href="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg=="><img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==" alt="" /></a></figure>
 <!-- /wp:core/image -->
diff --git a/packages/e2e-tests/fixtures/blocks/core__image__media-link.json b/packages/e2e-tests/fixtures/blocks/core__image__media-link.json
index 690fa778b6fd5b..18be10b3db12b2 100644
--- a/packages/e2e-tests/fixtures/blocks/core__image__media-link.json
+++ b/packages/e2e-tests/fixtures/blocks/core__image__media-link.json
@@ -4,13 +4,13 @@
         "name": "core/image",
         "isValid": true,
         "attributes": {
-            "url": "https://cldup.com/uuUqE_dXzy.jpg",
+            "url": "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==",
             "alt": "",
             "caption": "",
-            "href": "https://cldup.com/uuUqE_dXzy.jpg",
+            "href": "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==",
             "linkDestination": "media"
         },
         "innerBlocks": [],
-        "originalContent": "<figure class=\"wp-block-image\"><a href=\"https://cldup.com/uuUqE_dXzy.jpg\"><img src=\"https://cldup.com/uuUqE_dXzy.jpg\" alt=\"\" /></a></figure>"
+        "originalContent": "<figure class=\"wp-block-image\"><a href=\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==\"><img src=\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==\" alt=\"\" /></a></figure>"
     }
 ]
diff --git a/packages/e2e-tests/fixtures/blocks/core__image__media-link.parsed.json b/packages/e2e-tests/fixtures/blocks/core__image__media-link.parsed.json
index 46458a7eec3d7b..8ae21f34994eeb 100644
--- a/packages/e2e-tests/fixtures/blocks/core__image__media-link.parsed.json
+++ b/packages/e2e-tests/fixtures/blocks/core__image__media-link.parsed.json
@@ -5,9 +5,9 @@
             "linkDestination": "media"
         },
         "innerBlocks": [],
-        "innerHTML": "\n<figure class=\"wp-block-image\"><a href=\"https://cldup.com/uuUqE_dXzy.jpg\"><img src=\"https://cldup.com/uuUqE_dXzy.jpg\" alt=\"\" /></a></figure>\n",
+        "innerHTML": "\n<figure class=\"wp-block-image\"><a href=\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==\"><img src=\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==\" alt=\"\" /></a></figure>\n",
         "innerContent": [
-            "\n<figure class=\"wp-block-image\"><a href=\"https://cldup.com/uuUqE_dXzy.jpg\"><img src=\"https://cldup.com/uuUqE_dXzy.jpg\" alt=\"\" /></a></figure>\n"
+            "\n<figure class=\"wp-block-image\"><a href=\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==\"><img src=\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==\" alt=\"\" /></a></figure>\n"
         ]
     },
     {
diff --git a/packages/e2e-tests/fixtures/blocks/core__image__media-link.serialized.html b/packages/e2e-tests/fixtures/blocks/core__image__media-link.serialized.html
index 721abac903ff31..27020b189fcb54 100644
--- a/packages/e2e-tests/fixtures/blocks/core__image__media-link.serialized.html
+++ b/packages/e2e-tests/fixtures/blocks/core__image__media-link.serialized.html
@@ -1,3 +1,3 @@
 <!-- wp:image {"linkDestination":"media"} -->
-<figure class="wp-block-image"><a href="https://cldup.com/uuUqE_dXzy.jpg"><img src="https://cldup.com/uuUqE_dXzy.jpg" alt=""/></a></figure>
+<figure class="wp-block-image"><a href="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg=="><img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==" alt=""/></a></figure>
 <!-- /wp:image -->
diff --git a/packages/e2e-tests/fixtures/blocks/core__media-text.html b/packages/e2e-tests/fixtures/blocks/core__media-text.html
index ec516a98eb94df..1752272d148570 100644
--- a/packages/e2e-tests/fixtures/blocks/core__media-text.html
+++ b/packages/e2e-tests/fixtures/blocks/core__media-text.html
@@ -1,7 +1,7 @@
-<!-- wp:media-text {"mediaId":17985,"mediaType":"image"} -->
+<!-- wp:media-text {"mediaType":"image"} -->
 <div class="wp-block-media-text alignwide">
 	<figure class="wp-block-media-text__media">
-		<img src="http://localhost/wp-content/uploads/2018/09/1600px-Mount_Everest_as_seen_from_Drukair2_PLW_edit.jpg" alt="" class="wp-image-17985"/>
+		<img src="data:image/jpeg;base64,/9j/2wBDAAMCAgICAgMCAgIDAwMDBAYEBAQEBAgGBgUGCQgKCgkICQkKDA8MCgsOCwkJDRENDg8QEBEQCgwSExIQEw8QEBD/yQALCAABAAEBAREA/8wABgAQEAX/2gAIAQEAAD8A0s8g/9k=" alt=""/>
 	</figure>
 	<div class="wp-block-media-text__content">
 		<!-- wp:paragraph {"placeholder":"Content…","fontSize":"large"} -->
diff --git a/packages/e2e-tests/fixtures/blocks/core__media-text.json b/packages/e2e-tests/fixtures/blocks/core__media-text.json
index 09e4f0c6f68f38..e46863def45838 100644
--- a/packages/e2e-tests/fixtures/blocks/core__media-text.json
+++ b/packages/e2e-tests/fixtures/blocks/core__media-text.json
@@ -7,8 +7,7 @@
             "align": "wide",
             "mediaAlt": "",
             "mediaPosition": "left",
-            "mediaId": 17985,
-            "mediaUrl": "http://localhost/wp-content/uploads/2018/09/1600px-Mount_Everest_as_seen_from_Drukair2_PLW_edit.jpg",
+            "mediaUrl": "data:image/jpeg;base64,/9j/2wBDAAMCAgICAgMCAgIDAwMDBAYEBAQEBAgGBgUGCQgKCgkICQkKDA8MCgsOCwkJDRENDg8QEBEQCgwSExIQEw8QEBD/yQALCAABAAEBAREA/8wABgAQEAX/2gAIAQEAAD8A0s8g/9k=",
             "mediaType": "image",
             "mediaWidth": 50,
             "isStackedOnMobile": false
@@ -28,6 +27,6 @@
                 "originalContent": "<p class=\"has-large-font-size\">My Content</p>"
             }
         ],
-        "originalContent": "<div class=\"wp-block-media-text alignwide\">\n\t<figure class=\"wp-block-media-text__media\">\n\t\t<img src=\"http://localhost/wp-content/uploads/2018/09/1600px-Mount_Everest_as_seen_from_Drukair2_PLW_edit.jpg\" alt=\"\" class=\"wp-image-17985\"/>\n\t</figure>\n\t<div class=\"wp-block-media-text__content\">\n\t\t\n\t</div>\n</div>"
+        "originalContent": "<div class=\"wp-block-media-text alignwide\">\n\t<figure class=\"wp-block-media-text__media\">\n\t\t<img src=\"data:image/jpeg;base64,/9j/2wBDAAMCAgICAgMCAgIDAwMDBAYEBAQEBAgGBgUGCQgKCgkICQkKDA8MCgsOCwkJDRENDg8QEBEQCgwSExIQEw8QEBD/yQALCAABAAEBAREA/8wABgAQEAX/2gAIAQEAAD8A0s8g/9k=\" alt=\"\"/>\n\t</figure>\n\t<div class=\"wp-block-media-text__content\">\n\t\t\n\t</div>\n</div>"
     }
 ]
diff --git a/packages/e2e-tests/fixtures/blocks/core__media-text.parsed.json b/packages/e2e-tests/fixtures/blocks/core__media-text.parsed.json
index 7c758d02aa73a7..297be55236b462 100644
--- a/packages/e2e-tests/fixtures/blocks/core__media-text.parsed.json
+++ b/packages/e2e-tests/fixtures/blocks/core__media-text.parsed.json
@@ -2,7 +2,6 @@
     {
         "blockName": "core/media-text",
         "attrs": {
-            "mediaId": 17985,
             "mediaType": "image"
         },
         "innerBlocks": [
@@ -19,9 +18,9 @@
                 ]
             }
         ],
-        "innerHTML": "\n<div class=\"wp-block-media-text alignwide\">\n\t<figure class=\"wp-block-media-text__media\">\n\t\t<img src=\"http://localhost/wp-content/uploads/2018/09/1600px-Mount_Everest_as_seen_from_Drukair2_PLW_edit.jpg\" alt=\"\" class=\"wp-image-17985\"/>\n\t</figure>\n\t<div class=\"wp-block-media-text__content\">\n\t\t\n\t</div>\n</div>\n",
+        "innerHTML": "\n<div class=\"wp-block-media-text alignwide\">\n\t<figure class=\"wp-block-media-text__media\">\n\t\t<img src=\"data:image/jpeg;base64,/9j/2wBDAAMCAgICAgMCAgIDAwMDBAYEBAQEBAgGBgUGCQgKCgkICQkKDA8MCgsOCwkJDRENDg8QEBEQCgwSExIQEw8QEBD/yQALCAABAAEBAREA/8wABgAQEAX/2gAIAQEAAD8A0s8g/9k=\" alt=\"\"/>\n\t</figure>\n\t<div class=\"wp-block-media-text__content\">\n\t\t\n\t</div>\n</div>\n",
         "innerContent": [
-            "\n<div class=\"wp-block-media-text alignwide\">\n\t<figure class=\"wp-block-media-text__media\">\n\t\t<img src=\"http://localhost/wp-content/uploads/2018/09/1600px-Mount_Everest_as_seen_from_Drukair2_PLW_edit.jpg\" alt=\"\" class=\"wp-image-17985\"/>\n\t</figure>\n\t<div class=\"wp-block-media-text__content\">\n\t\t",
+            "\n<div class=\"wp-block-media-text alignwide\">\n\t<figure class=\"wp-block-media-text__media\">\n\t\t<img src=\"data:image/jpeg;base64,/9j/2wBDAAMCAgICAgMCAgIDAwMDBAYEBAQEBAgGBgUGCQgKCgkICQkKDA8MCgsOCwkJDRENDg8QEBEQCgwSExIQEw8QEBD/yQALCAABAAEBAREA/8wABgAQEAX/2gAIAQEAAD8A0s8g/9k=\" alt=\"\"/>\n\t</figure>\n\t<div class=\"wp-block-media-text__content\">\n\t\t",
             null,
             "\n\t</div>\n</div>\n"
         ]
diff --git a/packages/e2e-tests/fixtures/blocks/core__media-text.serialized.html b/packages/e2e-tests/fixtures/blocks/core__media-text.serialized.html
index 51d3cce84b74e6..22f1ac4f57ad9d 100644
--- a/packages/e2e-tests/fixtures/blocks/core__media-text.serialized.html
+++ b/packages/e2e-tests/fixtures/blocks/core__media-text.serialized.html
@@ -1,5 +1,5 @@
-<!-- wp:media-text {"mediaId":17985,"mediaType":"image"} -->
-<div class="wp-block-media-text alignwide"><figure class="wp-block-media-text__media"><img src="http://localhost/wp-content/uploads/2018/09/1600px-Mount_Everest_as_seen_from_Drukair2_PLW_edit.jpg" alt="" class="wp-image-17985"/></figure><div class="wp-block-media-text__content"><!-- wp:paragraph {"placeholder":"Content…","fontSize":"large"} -->
+<!-- wp:media-text {"mediaType":"image"} -->
+<div class="wp-block-media-text alignwide"><figure class="wp-block-media-text__media"><img src="data:image/jpeg;base64,/9j/2wBDAAMCAgICAgMCAgIDAwMDBAYEBAQEBAgGBgUGCQgKCgkICQkKDA8MCgsOCwkJDRENDg8QEBEQCgwSExIQEw8QEBD/yQALCAABAAEBAREA/8wABgAQEAX/2gAIAQEAAD8A0s8g/9k=" alt=""/></figure><div class="wp-block-media-text__content"><!-- wp:paragraph {"placeholder":"Content…","fontSize":"large"} -->
 <p class="has-large-font-size">My Content</p>
 <!-- /wp:paragraph --></div></div>
 <!-- /wp:media-text -->
diff --git a/packages/e2e-tests/fixtures/blocks/core__media-text__image-alt-no-align.html b/packages/e2e-tests/fixtures/blocks/core__media-text__image-alt-no-align.html
index 0c383e4537a57b..0537698f3e3815 100644
--- a/packages/e2e-tests/fixtures/blocks/core__media-text__image-alt-no-align.html
+++ b/packages/e2e-tests/fixtures/blocks/core__media-text__image-alt-no-align.html
@@ -1,7 +1,7 @@
-<!-- wp:media-text {"align":"none","mediaId":17985,"mediaType":"image"} -->
+<!-- wp:media-text {"align":"none","mediaType":"image"} -->
 <div class="wp-block-media-text">
 	<figure class="wp-block-media-text__media">
-		<img src="http://localhost/wp-content/uploads/2018/09/1600px-Mount_Everest_as_seen_from_Drukair2_PLW_edit.jpg" alt="my alt" class="wp-image-17985" />
+		<img src="data:image/jpeg;base64,/9j/2wBDAAMCAgICAgMCAgIDAwMDBAYEBAQEBAgGBgUGCQgKCgkICQkKDA8MCgsOCwkJDRENDg8QEBEQCgwSExIQEw8QEBD/yQALCAABAAEBAREA/8wABgAQEAX/2gAIAQEAAD8A0s8g/9k=" alt="my alt"/>
 	</figure>
 	<div class="wp-block-media-text__content">
 		<!-- wp:paragraph {"placeholder":"Content…","fontSize":"large"} -->
diff --git a/packages/e2e-tests/fixtures/blocks/core__media-text__image-alt-no-align.json b/packages/e2e-tests/fixtures/blocks/core__media-text__image-alt-no-align.json
index 0efacb35ee5b02..8aed7923b1cca9 100644
--- a/packages/e2e-tests/fixtures/blocks/core__media-text__image-alt-no-align.json
+++ b/packages/e2e-tests/fixtures/blocks/core__media-text__image-alt-no-align.json
@@ -7,8 +7,7 @@
             "align": "none",
             "mediaAlt": "my alt",
             "mediaPosition": "left",
-            "mediaId": 17985,
-            "mediaUrl": "http://localhost/wp-content/uploads/2018/09/1600px-Mount_Everest_as_seen_from_Drukair2_PLW_edit.jpg",
+            "mediaUrl": "data:image/jpeg;base64,/9j/2wBDAAMCAgICAgMCAgIDAwMDBAYEBAQEBAgGBgUGCQgKCgkICQkKDA8MCgsOCwkJDRENDg8QEBEQCgwSExIQEw8QEBD/yQALCAABAAEBAREA/8wABgAQEAX/2gAIAQEAAD8A0s8g/9k=",
             "mediaType": "image",
             "mediaWidth": 50,
             "isStackedOnMobile": false
@@ -28,6 +27,6 @@
                 "originalContent": "<p class=\"has-large-font-size\">Content</p>"
             }
         ],
-        "originalContent": "<div class=\"wp-block-media-text\">\n\t<figure class=\"wp-block-media-text__media\">\n\t\t<img src=\"http://localhost/wp-content/uploads/2018/09/1600px-Mount_Everest_as_seen_from_Drukair2_PLW_edit.jpg\" alt=\"my alt\" class=\"wp-image-17985\" />\n\t</figure>\n\t<div class=\"wp-block-media-text__content\">\n\t\t\n\t</div>\n</div>"
+        "originalContent": "<div class=\"wp-block-media-text\">\n\t<figure class=\"wp-block-media-text__media\">\n\t\t<img src=\"data:image/jpeg;base64,/9j/2wBDAAMCAgICAgMCAgIDAwMDBAYEBAQEBAgGBgUGCQgKCgkICQkKDA8MCgsOCwkJDRENDg8QEBEQCgwSExIQEw8QEBD/yQALCAABAAEBAREA/8wABgAQEAX/2gAIAQEAAD8A0s8g/9k=\" alt=\"my alt\"/>\n\t</figure>\n\t<div class=\"wp-block-media-text__content\">\n\t\t\n\t</div>\n</div>"
     }
 ]
diff --git a/packages/e2e-tests/fixtures/blocks/core__media-text__image-alt-no-align.parsed.json b/packages/e2e-tests/fixtures/blocks/core__media-text__image-alt-no-align.parsed.json
index 9068878ecf502e..a0e37007f86a19 100644
--- a/packages/e2e-tests/fixtures/blocks/core__media-text__image-alt-no-align.parsed.json
+++ b/packages/e2e-tests/fixtures/blocks/core__media-text__image-alt-no-align.parsed.json
@@ -3,7 +3,6 @@
         "blockName": "core/media-text",
         "attrs": {
             "align": "none",
-            "mediaId": 17985,
             "mediaType": "image"
         },
         "innerBlocks": [
@@ -20,9 +19,9 @@
                 ]
             }
         ],
-        "innerHTML": "\n<div class=\"wp-block-media-text\">\n\t<figure class=\"wp-block-media-text__media\">\n\t\t<img src=\"http://localhost/wp-content/uploads/2018/09/1600px-Mount_Everest_as_seen_from_Drukair2_PLW_edit.jpg\" alt=\"my alt\" class=\"wp-image-17985\" />\n\t</figure>\n\t<div class=\"wp-block-media-text__content\">\n\t\t\n\t</div>\n</div>\n",
+        "innerHTML": "\n<div class=\"wp-block-media-text\">\n\t<figure class=\"wp-block-media-text__media\">\n\t\t<img src=\"data:image/jpeg;base64,/9j/2wBDAAMCAgICAgMCAgIDAwMDBAYEBAQEBAgGBgUGCQgKCgkICQkKDA8MCgsOCwkJDRENDg8QEBEQCgwSExIQEw8QEBD/yQALCAABAAEBAREA/8wABgAQEAX/2gAIAQEAAD8A0s8g/9k=\" alt=\"my alt\"/>\n\t</figure>\n\t<div class=\"wp-block-media-text__content\">\n\t\t\n\t</div>\n</div>\n",
         "innerContent": [
-            "\n<div class=\"wp-block-media-text\">\n\t<figure class=\"wp-block-media-text__media\">\n\t\t<img src=\"http://localhost/wp-content/uploads/2018/09/1600px-Mount_Everest_as_seen_from_Drukair2_PLW_edit.jpg\" alt=\"my alt\" class=\"wp-image-17985\" />\n\t</figure>\n\t<div class=\"wp-block-media-text__content\">\n\t\t",
+            "\n<div class=\"wp-block-media-text\">\n\t<figure class=\"wp-block-media-text__media\">\n\t\t<img src=\"data:image/jpeg;base64,/9j/2wBDAAMCAgICAgMCAgIDAwMDBAYEBAQEBAgGBgUGCQgKCgkICQkKDA8MCgsOCwkJDRENDg8QEBEQCgwSExIQEw8QEBD/yQALCAABAAEBAREA/8wABgAQEAX/2gAIAQEAAD8A0s8g/9k=\" alt=\"my alt\"/>\n\t</figure>\n\t<div class=\"wp-block-media-text__content\">\n\t\t",
             null,
             "\n\t</div>\n</div>\n"
         ]
diff --git a/packages/e2e-tests/fixtures/blocks/core__media-text__image-alt-no-align.serialized.html b/packages/e2e-tests/fixtures/blocks/core__media-text__image-alt-no-align.serialized.html
index 9e00e7ce93ca1a..495c3b0df08e9d 100644
--- a/packages/e2e-tests/fixtures/blocks/core__media-text__image-alt-no-align.serialized.html
+++ b/packages/e2e-tests/fixtures/blocks/core__media-text__image-alt-no-align.serialized.html
@@ -1,5 +1,5 @@
-<!-- wp:media-text {"align":"none","mediaId":17985,"mediaType":"image"} -->
-<div class="wp-block-media-text"><figure class="wp-block-media-text__media"><img src="http://localhost/wp-content/uploads/2018/09/1600px-Mount_Everest_as_seen_from_Drukair2_PLW_edit.jpg" alt="my alt" class="wp-image-17985"/></figure><div class="wp-block-media-text__content"><!-- wp:paragraph {"placeholder":"Content…","fontSize":"large"} -->
+<!-- wp:media-text {"align":"none","mediaType":"image"} -->
+<div class="wp-block-media-text"><figure class="wp-block-media-text__media"><img src="data:image/jpeg;base64,/9j/2wBDAAMCAgICAgMCAgIDAwMDBAYEBAQEBAgGBgUGCQgKCgkICQkKDA8MCgsOCwkJDRENDg8QEBEQCgwSExIQEw8QEBD/yQALCAABAAEBAREA/8wABgAQEAX/2gAIAQEAAD8A0s8g/9k=" alt="my alt"/></figure><div class="wp-block-media-text__content"><!-- wp:paragraph {"placeholder":"Content…","fontSize":"large"} -->
 <p class="has-large-font-size">Content</p>
 <!-- /wp:paragraph --></div></div>
 <!-- /wp:media-text -->
diff --git a/packages/e2e-tests/fixtures/blocks/core__media-text__is-stacked-on-mobile.html b/packages/e2e-tests/fixtures/blocks/core__media-text__is-stacked-on-mobile.html
index 0aa403f6c3017a..8aab369319b39a 100644
--- a/packages/e2e-tests/fixtures/blocks/core__media-text__is-stacked-on-mobile.html
+++ b/packages/e2e-tests/fixtures/blocks/core__media-text__is-stacked-on-mobile.html
@@ -1,7 +1,7 @@
-<!-- wp:media-text {"mediaId":17897,"mediaType":"video", "isStackedOnMobile": true} -->
+<!-- wp:media-text {"mediaType":"video", "isStackedOnMobile": true} -->
 <div class="wp-block-media-text alignwide is-stacked-on-mobile">
 	<figure class="wp-block-media-text__media">
-		<video controls src="http://localhost/wp-content/uploads/2018/09/Jul-26-2018-11-34-54.mp4"></video>
+		<video controls src="data:video/mp4;base64,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"></video>
 	</figure>
 	<div class="wp-block-media-text__content">
 		<!-- wp:paragraph {"placeholder":"Content…","fontSize":"large"} -->
diff --git a/packages/e2e-tests/fixtures/blocks/core__media-text__is-stacked-on-mobile.json b/packages/e2e-tests/fixtures/blocks/core__media-text__is-stacked-on-mobile.json
index 85d29db70eaf74..c3c9b460bf619b 100644
--- a/packages/e2e-tests/fixtures/blocks/core__media-text__is-stacked-on-mobile.json
+++ b/packages/e2e-tests/fixtures/blocks/core__media-text__is-stacked-on-mobile.json
@@ -7,8 +7,7 @@
             "align": "wide",
             "mediaAlt": "",
             "mediaPosition": "left",
-            "mediaId": 17897,
-            "mediaUrl": "http://localhost/wp-content/uploads/2018/09/Jul-26-2018-11-34-54.mp4",
+            "mediaUrl": "data:video/mp4;base64,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",
             "mediaType": "video",
             "mediaWidth": 50,
             "isStackedOnMobile": true
@@ -28,6 +27,6 @@
                 "originalContent": "<p class=\"has-large-font-size\">My Content</p>"
             }
         ],
-        "originalContent": "<div class=\"wp-block-media-text alignwide is-stacked-on-mobile\">\n\t<figure class=\"wp-block-media-text__media\">\n\t\t<video controls src=\"http://localhost/wp-content/uploads/2018/09/Jul-26-2018-11-34-54.mp4\"></video>\n\t</figure>\n\t<div class=\"wp-block-media-text__content\">\n\t\t\n\t</div>\n</div>"
+        "originalContent": "<div class=\"wp-block-media-text alignwide is-stacked-on-mobile\">\n\t<figure class=\"wp-block-media-text__media\">\n\t\t<video controls src=\"data:video/mp4;base64,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\"></video>\n\t</figure>\n\t<div class=\"wp-block-media-text__content\">\n\t\t\n\t</div>\n</div>"
     }
 ]
diff --git a/packages/e2e-tests/fixtures/blocks/core__media-text__is-stacked-on-mobile.parsed.json b/packages/e2e-tests/fixtures/blocks/core__media-text__is-stacked-on-mobile.parsed.json
index 3451267ab68971..1e5df74e4d13ae 100644
--- a/packages/e2e-tests/fixtures/blocks/core__media-text__is-stacked-on-mobile.parsed.json
+++ b/packages/e2e-tests/fixtures/blocks/core__media-text__is-stacked-on-mobile.parsed.json
@@ -2,7 +2,6 @@
     {
         "blockName": "core/media-text",
         "attrs": {
-            "mediaId": 17897,
             "mediaType": "video",
             "isStackedOnMobile": true
         },
@@ -20,9 +19,9 @@
                 ]
             }
         ],
-        "innerHTML": "\n<div class=\"wp-block-media-text alignwide is-stacked-on-mobile\">\n\t<figure class=\"wp-block-media-text__media\">\n\t\t<video controls src=\"http://localhost/wp-content/uploads/2018/09/Jul-26-2018-11-34-54.mp4\"></video>\n\t</figure>\n\t<div class=\"wp-block-media-text__content\">\n\t\t\n\t</div>\n</div>\n",
+        "innerHTML": "\n<div class=\"wp-block-media-text alignwide is-stacked-on-mobile\">\n\t<figure class=\"wp-block-media-text__media\">\n\t\t<video controls src=\"data:video/mp4;base64,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\"></video>\n\t</figure>\n\t<div class=\"wp-block-media-text__content\">\n\t\t\n\t</div>\n</div>\n",
         "innerContent": [
-            "\n<div class=\"wp-block-media-text alignwide is-stacked-on-mobile\">\n\t<figure class=\"wp-block-media-text__media\">\n\t\t<video controls src=\"http://localhost/wp-content/uploads/2018/09/Jul-26-2018-11-34-54.mp4\"></video>\n\t</figure>\n\t<div class=\"wp-block-media-text__content\">\n\t\t",
+            "\n<div class=\"wp-block-media-text alignwide is-stacked-on-mobile\">\n\t<figure class=\"wp-block-media-text__media\">\n\t\t<video controls src=\"data:video/mp4;base64,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\"></video>\n\t</figure>\n\t<div class=\"wp-block-media-text__content\">\n\t\t",
             null,
             "\n\t</div>\n</div>\n"
         ]
diff --git a/packages/e2e-tests/fixtures/blocks/core__media-text__is-stacked-on-mobile.serialized.html b/packages/e2e-tests/fixtures/blocks/core__media-text__is-stacked-on-mobile.serialized.html
index b9a82b9d842cc5..b24fdf0a1fd436 100644
--- a/packages/e2e-tests/fixtures/blocks/core__media-text__is-stacked-on-mobile.serialized.html
+++ b/packages/e2e-tests/fixtures/blocks/core__media-text__is-stacked-on-mobile.serialized.html
@@ -1,5 +1,5 @@
-<!-- wp:media-text {"mediaId":17897,"mediaType":"video","isStackedOnMobile":true} -->
-<div class="wp-block-media-text alignwide is-stacked-on-mobile"><figure class="wp-block-media-text__media"><video controls src="http://localhost/wp-content/uploads/2018/09/Jul-26-2018-11-34-54.mp4"></video></figure><div class="wp-block-media-text__content"><!-- wp:paragraph {"placeholder":"Content…","fontSize":"large"} -->
+<!-- wp:media-text {"mediaType":"video","isStackedOnMobile":true} -->
+<div class="wp-block-media-text alignwide is-stacked-on-mobile"><figure class="wp-block-media-text__media"><video controls src="data:video/mp4;base64,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"></video></figure><div class="wp-block-media-text__content"><!-- wp:paragraph {"placeholder":"Content…","fontSize":"large"} -->
 <p class="has-large-font-size">My Content</p>
 <!-- /wp:paragraph --></div></div>
 <!-- /wp:media-text -->
diff --git a/packages/e2e-tests/fixtures/blocks/core__media-text__media-right-custom-width.html b/packages/e2e-tests/fixtures/blocks/core__media-text__media-right-custom-width.html
index b0772fb7b44d99..45252b7a306b8c 100644
--- a/packages/e2e-tests/fixtures/blocks/core__media-text__media-right-custom-width.html
+++ b/packages/e2e-tests/fixtures/blocks/core__media-text__media-right-custom-width.html
@@ -1,7 +1,7 @@
-<!-- wp:media-text {"align":"full","mediaPosition":"right","mediaId":17897,"mediaType":"video","mediaWidth":41} -->
+<!-- wp:media-text {"align":"full","mediaPosition":"right","mediaType":"video","mediaWidth":41} -->
 <div class="wp-block-media-text alignfull has-media-on-the-right" style="grid-template-columns:auto 41%">
 	<figure class="wp-block-media-text__media">
-		<video controls src="http://localhost/wp-content/uploads/2018/09/Jul-26-2018-11-34-54.mp4"></video>
+		<video controls src="data:video/mp4;base64,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"></video>
 	</figure>
 	<div class="wp-block-media-text__content">
 		<!-- wp:paragraph {"align":"right","placeholder":"Content…","fontSize":"large"} -->
diff --git a/packages/e2e-tests/fixtures/blocks/core__media-text__media-right-custom-width.json b/packages/e2e-tests/fixtures/blocks/core__media-text__media-right-custom-width.json
index 42d3a5ab16bce4..b3bf94da24828a 100644
--- a/packages/e2e-tests/fixtures/blocks/core__media-text__media-right-custom-width.json
+++ b/packages/e2e-tests/fixtures/blocks/core__media-text__media-right-custom-width.json
@@ -7,8 +7,7 @@
             "align": "full",
             "mediaAlt": "",
             "mediaPosition": "right",
-            "mediaId": 17897,
-            "mediaUrl": "http://localhost/wp-content/uploads/2018/09/Jul-26-2018-11-34-54.mp4",
+            "mediaUrl": "data:video/mp4;base64,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",
             "mediaType": "video",
             "mediaWidth": 41,
             "isStackedOnMobile": false
@@ -29,6 +28,6 @@
                 "originalContent": "<p style=\"text-align:right\" class=\"has-large-font-size\">My video</p>"
             }
         ],
-        "originalContent": "<div class=\"wp-block-media-text alignfull has-media-on-the-right\" style=\"grid-template-columns:auto 41%\">\n\t<figure class=\"wp-block-media-text__media\">\n\t\t<video controls src=\"http://localhost/wp-content/uploads/2018/09/Jul-26-2018-11-34-54.mp4\"></video>\n\t</figure>\n\t<div class=\"wp-block-media-text__content\">\n\t\t\n\t</div>\n</div>"
+        "originalContent": "<div class=\"wp-block-media-text alignfull has-media-on-the-right\" style=\"grid-template-columns:auto 41%\">\n\t<figure class=\"wp-block-media-text__media\">\n\t\t<video controls src=\"data:video/mp4;base64,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\"></video>\n\t</figure>\n\t<div class=\"wp-block-media-text__content\">\n\t\t\n\t</div>\n</div>"
     }
 ]
diff --git a/packages/e2e-tests/fixtures/blocks/core__media-text__media-right-custom-width.parsed.json b/packages/e2e-tests/fixtures/blocks/core__media-text__media-right-custom-width.parsed.json
index 37484502190c7b..ee577a366f0f8a 100644
--- a/packages/e2e-tests/fixtures/blocks/core__media-text__media-right-custom-width.parsed.json
+++ b/packages/e2e-tests/fixtures/blocks/core__media-text__media-right-custom-width.parsed.json
@@ -4,7 +4,6 @@
         "attrs": {
             "align": "full",
             "mediaPosition": "right",
-            "mediaId": 17897,
             "mediaType": "video",
             "mediaWidth": 41
         },
@@ -23,9 +22,9 @@
                 ]
             }
         ],
-        "innerHTML": "\n<div class=\"wp-block-media-text alignfull has-media-on-the-right\" style=\"grid-template-columns:auto 41%\">\n\t<figure class=\"wp-block-media-text__media\">\n\t\t<video controls src=\"http://localhost/wp-content/uploads/2018/09/Jul-26-2018-11-34-54.mp4\"></video>\n\t</figure>\n\t<div class=\"wp-block-media-text__content\">\n\t\t\n\t</div>\n</div>\n",
+        "innerHTML": "\n<div class=\"wp-block-media-text alignfull has-media-on-the-right\" style=\"grid-template-columns:auto 41%\">\n\t<figure class=\"wp-block-media-text__media\">\n\t\t<video controls src=\"data:video/mp4;base64,AAAAHGZ0eXBpc29tAAACAGlzb21pc28ybXA0MQAAAAhmcmVlAAAC721kYXQhEAUgpBv/wAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA3pwAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAcCEQBSCkG//AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAADengAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAcAAAAsJtb292AAAAbG12aGQAAAAAAAAAAAAAAAAAAAPoAAAALwABAAABAAAAAAAAAAAAAAAAAQAAAAAAAAAAAAAAAAAAAAEAAAAAAAAAAAAAAAAAAEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAADAAAB7HRyYWsAAABcdGtoZAAAAAMAAAAAAAAAAAAAAAIAAAAAAAAALwAAAAAAAAAAAAAAAQEAAAAAAQAAAAAAAAAAAAAAAAAAAAEAAAAAAAAAAAAAAAAAAEAAAAAAAAAAAAAAAAAAACRlZHRzAAAAHGVsc3QAAAAAAAAAAQAAAC8AAAAAAAEAAAAAAWRtZGlhAAAAIG1kaGQAAAAAAAAAAAAAAAAAAKxEAAAIAFXEAAAAAAAtaGRscgAAAAAAAAAAc291bgAAAAAAAAAAAAAAAFNvdW5kSGFuZGxlcgAAAAEPbWluZgAAABBzbWhkAAAAAAAAAAAAAAAkZGluZgAAABxkcmVmAAAAAAAAAAEAAAAMdXJsIAAAAAEAAADTc3RibAAAAGdzdHNkAAAAAAAAAAEAAABXbXA0YQAAAAAAAAABAAAAAAAAAAAAAgAQAAAAAKxEAAAAAAAzZXNkcwAAAAADgICAIgACAASAgIAUQBUAAAAAAfQAAAHz+QWAgIACEhAGgICAAQIAAAAYc3R0cwAAAAAAAAABAAAAAgAABAAAAAAcc3RzYwAAAAAAAAABAAAAAQAAAAIAAAABAAAAHHN0c3oAAAAAAAAAAAAAAAIAAAFzAAABdAAAABRzdGNvAAAAAAAAAAEAAAAsAAAAYnVkdGEAAABabWV0YQAAAAAAAAAhaGRscgAAAAAAAAAAbWRpcmFwcGwAAAAAAAAAAAAAAAAtaWxzdAAAACWpdG9vAAAAHWRhdGEAAAABAAAAAExhdmY1Ni40MC4xMDE=\"></video>\n\t</figure>\n\t<div class=\"wp-block-media-text__content\">\n\t\t\n\t</div>\n</div>\n",
         "innerContent": [
-            "\n<div class=\"wp-block-media-text alignfull has-media-on-the-right\" style=\"grid-template-columns:auto 41%\">\n\t<figure class=\"wp-block-media-text__media\">\n\t\t<video controls src=\"http://localhost/wp-content/uploads/2018/09/Jul-26-2018-11-34-54.mp4\"></video>\n\t</figure>\n\t<div class=\"wp-block-media-text__content\">\n\t\t",
+            "\n<div class=\"wp-block-media-text alignfull has-media-on-the-right\" style=\"grid-template-columns:auto 41%\">\n\t<figure class=\"wp-block-media-text__media\">\n\t\t<video controls src=\"data:video/mp4;base64,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\"></video>\n\t</figure>\n\t<div class=\"wp-block-media-text__content\">\n\t\t",
             null,
             "\n\t</div>\n</div>\n"
         ]
diff --git a/packages/e2e-tests/fixtures/blocks/core__media-text__media-right-custom-width.serialized.html b/packages/e2e-tests/fixtures/blocks/core__media-text__media-right-custom-width.serialized.html
index a11efac920f287..857ad7de389cd4 100644
--- a/packages/e2e-tests/fixtures/blocks/core__media-text__media-right-custom-width.serialized.html
+++ b/packages/e2e-tests/fixtures/blocks/core__media-text__media-right-custom-width.serialized.html
@@ -1,5 +1,5 @@
-<!-- wp:media-text {"align":"full","mediaPosition":"right","mediaId":17897,"mediaType":"video","mediaWidth":41} -->
-<div class="wp-block-media-text alignfull has-media-on-the-right" style="grid-template-columns:auto 41%"><figure class="wp-block-media-text__media"><video controls src="http://localhost/wp-content/uploads/2018/09/Jul-26-2018-11-34-54.mp4"></video></figure><div class="wp-block-media-text__content"><!-- wp:paragraph {"align":"right","placeholder":"Content…","fontSize":"large"} -->
+<!-- wp:media-text {"align":"full","mediaPosition":"right","mediaType":"video","mediaWidth":41} -->
+<div class="wp-block-media-text alignfull has-media-on-the-right" style="grid-template-columns:auto 41%"><figure class="wp-block-media-text__media"><video controls src="data:video/mp4;base64,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"></video></figure><div class="wp-block-media-text__content"><!-- wp:paragraph {"align":"right","placeholder":"Content…","fontSize":"large"} -->
 <p style="text-align:right" class="has-large-font-size">My video</p>
 <!-- /wp:paragraph --></div></div>
 <!-- /wp:media-text -->
diff --git a/packages/e2e-tests/fixtures/blocks/core__media-text__video.html b/packages/e2e-tests/fixtures/blocks/core__media-text__video.html
index 48c13cac64d085..9122112e50be5c 100644
--- a/packages/e2e-tests/fixtures/blocks/core__media-text__video.html
+++ b/packages/e2e-tests/fixtures/blocks/core__media-text__video.html
@@ -1,7 +1,7 @@
-<!-- wp:media-text {"mediaId":17897,"mediaType":"video"} -->
+<!-- wp:media-text {"mediaType":"video"} -->
 <div class="wp-block-media-text alignwide">
 	<figure class="wp-block-media-text__media">
-		<video controls src="http://localhost/wp-content/uploads/2018/09/Jul-26-2018-11-34-54.mp4"></video>
+		<video controls src="data:video/mp4;base64,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"></video>
 	</figure>
 	<div class="wp-block-media-text__content">
 		<!-- wp:paragraph {"placeholder":"Content…","fontSize":"large"} -->
diff --git a/packages/e2e-tests/fixtures/blocks/core__media-text__video.json b/packages/e2e-tests/fixtures/blocks/core__media-text__video.json
index 427195d751016d..e9876c510fd41a 100644
--- a/packages/e2e-tests/fixtures/blocks/core__media-text__video.json
+++ b/packages/e2e-tests/fixtures/blocks/core__media-text__video.json
@@ -7,8 +7,7 @@
             "align": "wide",
             "mediaAlt": "",
             "mediaPosition": "left",
-            "mediaId": 17897,
-            "mediaUrl": "http://localhost/wp-content/uploads/2018/09/Jul-26-2018-11-34-54.mp4",
+            "mediaUrl": "data:video/mp4;base64,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",
             "mediaType": "video",
             "mediaWidth": 50,
             "isStackedOnMobile": false
@@ -28,6 +27,6 @@
                 "originalContent": "<p class=\"has-large-font-size\">My Content</p>"
             }
         ],
-        "originalContent": "<div class=\"wp-block-media-text alignwide\">\n\t<figure class=\"wp-block-media-text__media\">\n\t\t<video controls src=\"http://localhost/wp-content/uploads/2018/09/Jul-26-2018-11-34-54.mp4\"></video>\n\t</figure>\n\t<div class=\"wp-block-media-text__content\">\n\t\t\n\t</div>\n</div>"
+        "originalContent": "<div class=\"wp-block-media-text alignwide\">\n\t<figure class=\"wp-block-media-text__media\">\n\t\t<video controls src=\"data:video/mp4;base64,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\"></video>\n\t</figure>\n\t<div class=\"wp-block-media-text__content\">\n\t\t\n\t</div>\n</div>"
     }
 ]
diff --git a/packages/e2e-tests/fixtures/blocks/core__media-text__video.parsed.json b/packages/e2e-tests/fixtures/blocks/core__media-text__video.parsed.json
index 4e06eb858a5208..fe2ec87d1eeb0b 100644
--- a/packages/e2e-tests/fixtures/blocks/core__media-text__video.parsed.json
+++ b/packages/e2e-tests/fixtures/blocks/core__media-text__video.parsed.json
@@ -2,7 +2,6 @@
     {
         "blockName": "core/media-text",
         "attrs": {
-            "mediaId": 17897,
             "mediaType": "video"
         },
         "innerBlocks": [
@@ -19,9 +18,9 @@
                 ]
             }
         ],
-        "innerHTML": "\n<div class=\"wp-block-media-text alignwide\">\n\t<figure class=\"wp-block-media-text__media\">\n\t\t<video controls src=\"http://localhost/wp-content/uploads/2018/09/Jul-26-2018-11-34-54.mp4\"></video>\n\t</figure>\n\t<div class=\"wp-block-media-text__content\">\n\t\t\n\t</div>\n</div>\n",
+        "innerHTML": "\n<div class=\"wp-block-media-text alignwide\">\n\t<figure class=\"wp-block-media-text__media\">\n\t\t<video controls src=\"data:video/mp4;base64,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\"></video>\n\t</figure>\n\t<div class=\"wp-block-media-text__content\">\n\t\t\n\t</div>\n</div>\n",
         "innerContent": [
-            "\n<div class=\"wp-block-media-text alignwide\">\n\t<figure class=\"wp-block-media-text__media\">\n\t\t<video controls src=\"http://localhost/wp-content/uploads/2018/09/Jul-26-2018-11-34-54.mp4\"></video>\n\t</figure>\n\t<div class=\"wp-block-media-text__content\">\n\t\t",
+            "\n<div class=\"wp-block-media-text alignwide\">\n\t<figure class=\"wp-block-media-text__media\">\n\t\t<video controls src=\"data:video/mp4;base64,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\"></video>\n\t</figure>\n\t<div class=\"wp-block-media-text__content\">\n\t\t",
             null,
             "\n\t</div>\n</div>\n"
         ]
diff --git a/packages/e2e-tests/fixtures/blocks/core__media-text__video.serialized.html b/packages/e2e-tests/fixtures/blocks/core__media-text__video.serialized.html
index f7302c9a33c5dc..a428bf311c8ee9 100644
--- a/packages/e2e-tests/fixtures/blocks/core__media-text__video.serialized.html
+++ b/packages/e2e-tests/fixtures/blocks/core__media-text__video.serialized.html
@@ -1,5 +1,5 @@
-<!-- wp:media-text {"mediaId":17897,"mediaType":"video"} -->
-<div class="wp-block-media-text alignwide"><figure class="wp-block-media-text__media"><video controls src="http://localhost/wp-content/uploads/2018/09/Jul-26-2018-11-34-54.mp4"></video></figure><div class="wp-block-media-text__content"><!-- wp:paragraph {"placeholder":"Content…","fontSize":"large"} -->
+<!-- wp:media-text {"mediaType":"video"} -->
+<div class="wp-block-media-text alignwide"><figure class="wp-block-media-text__media"><video controls src="data:video/mp4;base64,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"></video></figure><div class="wp-block-media-text__content"><!-- wp:paragraph {"placeholder":"Content…","fontSize":"large"} -->
 <p class="has-large-font-size">My Content</p>
 <!-- /wp:paragraph --></div></div>
 <!-- /wp:media-text -->
diff --git a/packages/e2e-tests/fixtures/blocks/core__video.html b/packages/e2e-tests/fixtures/blocks/core__video.html
index dd720ecda8bf53..67f6f86fec0955 100644
--- a/packages/e2e-tests/fixtures/blocks/core__video.html
+++ b/packages/e2e-tests/fixtures/blocks/core__video.html
@@ -1,3 +1,3 @@
 <!-- wp:core/video -->
-<figure class="wp-block-video"><video controls src="https://awesome-fake.video/file.mp4"></video></figure>
+<figure class="wp-block-video"><video controls src="data:video/mp4;base64,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"></video></figure>
 <!-- /wp:core/video -->
diff --git a/packages/e2e-tests/fixtures/blocks/core__video.json b/packages/e2e-tests/fixtures/blocks/core__video.json
index cb19827f7ad7b2..c926e1332b5e54 100644
--- a/packages/e2e-tests/fixtures/blocks/core__video.json
+++ b/packages/e2e-tests/fixtures/blocks/core__video.json
@@ -9,11 +9,11 @@
             "controls": true,
             "loop": false,
             "muted": false,
-            "playsInline": false,
             "preload": "metadata",
-            "src": "https://awesome-fake.video/file.mp4"
+            "src": "data:video/mp4;base64,AAAAHGZ0eXBpc29tAAACAGlzb21pc28ybXA0MQAAAAhmcmVlAAAC721kYXQhEAUgpBv/wAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA3pwAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAcCEQBSCkG//AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAADengAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAcAAAAsJtb292AAAAbG12aGQAAAAAAAAAAAAAAAAAAAPoAAAALwABAAABAAAAAAAAAAAAAAAAAQAAAAAAAAAAAAAAAAAAAAEAAAAAAAAAAAAAAAAAAEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAADAAAB7HRyYWsAAABcdGtoZAAAAAMAAAAAAAAAAAAAAAIAAAAAAAAALwAAAAAAAAAAAAAAAQEAAAAAAQAAAAAAAAAAAAAAAAAAAAEAAAAAAAAAAAAAAAAAAEAAAAAAAAAAAAAAAAAAACRlZHRzAAAAHGVsc3QAAAAAAAAAAQAAAC8AAAAAAAEAAAAAAWRtZGlhAAAAIG1kaGQAAAAAAAAAAAAAAAAAAKxEAAAIAFXEAAAAAAAtaGRscgAAAAAAAAAAc291bgAAAAAAAAAAAAAAAFNvdW5kSGFuZGxlcgAAAAEPbWluZgAAABBzbWhkAAAAAAAAAAAAAAAkZGluZgAAABxkcmVmAAAAAAAAAAEAAAAMdXJsIAAAAAEAAADTc3RibAAAAGdzdHNkAAAAAAAAAAEAAABXbXA0YQAAAAAAAAABAAAAAAAAAAAAAgAQAAAAAKxEAAAAAAAzZXNkcwAAAAADgICAIgACAASAgIAUQBUAAAAAAfQAAAHz+QWAgIACEhAGgICAAQIAAAAYc3R0cwAAAAAAAAABAAAAAgAABAAAAAAcc3RzYwAAAAAAAAABAAAAAQAAAAIAAAABAAAAHHN0c3oAAAAAAAAAAAAAAAIAAAFzAAABdAAAABRzdGNvAAAAAAAAAAEAAAAsAAAAYnVkdGEAAABabWV0YQAAAAAAAAAhaGRscgAAAAAAAAAAbWRpcmFwcGwAAAAAAAAAAAAAAAAtaWxzdAAAACWpdG9vAAAAHWRhdGEAAAABAAAAAExhdmY1Ni40MC4xMDE=",
+            "playsInline": false
         },
         "innerBlocks": [],
-        "originalContent": "<figure class=\"wp-block-video\"><video controls src=\"https://awesome-fake.video/file.mp4\"></video></figure>"
+        "originalContent": "<figure class=\"wp-block-video\"><video controls src=\"data:video/mp4;base64,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\"></video></figure>"
     }
 ]
diff --git a/packages/e2e-tests/fixtures/blocks/core__video.parsed.json b/packages/e2e-tests/fixtures/blocks/core__video.parsed.json
index 5fd5505e395f76..e270252ee38745 100644
--- a/packages/e2e-tests/fixtures/blocks/core__video.parsed.json
+++ b/packages/e2e-tests/fixtures/blocks/core__video.parsed.json
@@ -3,9 +3,9 @@
         "blockName": "core/video",
         "attrs": {},
         "innerBlocks": [],
-        "innerHTML": "\n<figure class=\"wp-block-video\"><video controls src=\"https://awesome-fake.video/file.mp4\"></video></figure>\n",
+        "innerHTML": "\n<figure class=\"wp-block-video\"><video controls src=\"data:video/mp4;base64,AAAAHGZ0eXBpc29tAAACAGlzb21pc28ybXA0MQAAAAhmcmVlAAAC721kYXQhEAUgpBv/wAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA3pwAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAcCEQBSCkG//AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAADengAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAcAAAAsJtb292AAAAbG12aGQAAAAAAAAAAAAAAAAAAAPoAAAALwABAAABAAAAAAAAAAAAAAAAAQAAAAAAAAAAAAAAAAAAAAEAAAAAAAAAAAAAAAAAAEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAADAAAB7HRyYWsAAABcdGtoZAAAAAMAAAAAAAAAAAAAAAIAAAAAAAAALwAAAAAAAAAAAAAAAQEAAAAAAQAAAAAAAAAAAAAAAAAAAAEAAAAAAAAAAAAAAAAAAEAAAAAAAAAAAAAAAAAAACRlZHRzAAAAHGVsc3QAAAAAAAAAAQAAAC8AAAAAAAEAAAAAAWRtZGlhAAAAIG1kaGQAAAAAAAAAAAAAAAAAAKxEAAAIAFXEAAAAAAAtaGRscgAAAAAAAAAAc291bgAAAAAAAAAAAAAAAFNvdW5kSGFuZGxlcgAAAAEPbWluZgAAABBzbWhkAAAAAAAAAAAAAAAkZGluZgAAABxkcmVmAAAAAAAAAAEAAAAMdXJsIAAAAAEAAADTc3RibAAAAGdzdHNkAAAAAAAAAAEAAABXbXA0YQAAAAAAAAABAAAAAAAAAAAAAgAQAAAAAKxEAAAAAAAzZXNkcwAAAAADgICAIgACAASAgIAUQBUAAAAAAfQAAAHz+QWAgIACEhAGgICAAQIAAAAYc3R0cwAAAAAAAAABAAAAAgAABAAAAAAcc3RzYwAAAAAAAAABAAAAAQAAAAIAAAABAAAAHHN0c3oAAAAAAAAAAAAAAAIAAAFzAAABdAAAABRzdGNvAAAAAAAAAAEAAAAsAAAAYnVkdGEAAABabWV0YQAAAAAAAAAhaGRscgAAAAAAAAAAbWRpcmFwcGwAAAAAAAAAAAAAAAAtaWxzdAAAACWpdG9vAAAAHWRhdGEAAAABAAAAAExhdmY1Ni40MC4xMDE=\"></video></figure>\n",
         "innerContent": [
-            "\n<figure class=\"wp-block-video\"><video controls src=\"https://awesome-fake.video/file.mp4\"></video></figure>\n"
+            "\n<figure class=\"wp-block-video\"><video controls src=\"data:video/mp4;base64,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\"></video></figure>\n"
         ]
     },
     {
diff --git a/packages/e2e-tests/fixtures/blocks/core__video.serialized.html b/packages/e2e-tests/fixtures/blocks/core__video.serialized.html
index 48dca62aecd32a..b3d567b5c0d698 100644
--- a/packages/e2e-tests/fixtures/blocks/core__video.serialized.html
+++ b/packages/e2e-tests/fixtures/blocks/core__video.serialized.html
@@ -1,3 +1,3 @@
 <!-- wp:video -->
-<figure class="wp-block-video"><video controls src="https://awesome-fake.video/file.mp4"></video></figure>
+<figure class="wp-block-video"><video controls src="data:video/mp4;base64,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"></video></figure>
 <!-- /wp:video -->
diff --git a/packages/e2e-tests/specs/__snapshots__/block-transforms.test.js.snap b/packages/e2e-tests/specs/__snapshots__/block-transforms.test.js.snap
index 677a85dc97bdac..13e2f3c192ccfd 100644
--- a/packages/e2e-tests/specs/__snapshots__/block-transforms.test.js.snap
+++ b/packages/e2e-tests/specs/__snapshots__/block-transforms.test.js.snap
@@ -1,5 +1,11 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
+exports[`Block transforms correctly transform block Audio in fixture core__audio into the File block 1`] = `
+"<!-- wp:file {\\"href\\":\\"data:audio/mpeg;base64,/+MYxAAAAANIAAAAAExBTUUzLjk4LjIAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\\"} -->
+<div class=\\"wp-block-file\\"><a href=\\"data:audio/mpeg;base64,/+MYxAAAAANIAAAAAExBTUUzLjk4LjIAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\\" class=\\"wp-block-file__button\\" download>Download</a></div>
+<!-- /wp:file -->"
+`;
+
 exports[`Block transforms correctly transform block Code in fixture core__code into the Preformatted block 1`] = `
 "<!-- wp:preformatted -->
 <pre class=\\"wp-block-preformatted\\">export default function MyButton() {
@@ -8,6 +14,44 @@ exports[`Block transforms correctly transform block Code in fixture core__code i
 <!-- /wp:preformatted -->"
 `;
 
+exports[`Block transforms correctly transform block Cover in fixture core__cover into the Image block 1`] = `
+"<!-- wp:image -->
+<figure class=\\"wp-block-image\\"><img src=\\"data:image/jpeg;base64,/9j/2wBDAAMCAgICAgMCAgIDAwMDBAYEBAQEBAgGBgUGCQgKCgkICQkKDA8MCgsOCwkJDRENDg8QEBEQCgwSExIQEw8QEBD/yQALCAABAAEBAREA/8wABgAQEAX/2gAIAQEAAD8A0s8g/9k=\\" alt=\\"\\"/></figure>
+<!-- /wp:image -->"
+`;
+
+exports[`Block transforms correctly transform block Cover in fixture core__cover__video into the Video block 1`] = `
+"<!-- wp:video -->
+<figure class=\\"wp-block-video\\"><video controls src=\\"data:video/mp4;base64,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\\"></video></figure>
+<!-- /wp:video -->"
+`;
+
+exports[`Block transforms correctly transform block Cover in fixture core__cover__video-overlay into the Video block 1`] = `
+"<!-- wp:video -->
+<figure class=\\"wp-block-video\\"><video controls src=\\"data:video/mp4;base64,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\\"></video></figure>
+<!-- /wp:video -->"
+`;
+
+exports[`Block transforms correctly transform block Gallery in fixture core__gallery into the Image block 1`] = `
+"<!-- wp:image -->
+<figure class=\\"wp-block-image\\"><img src=\\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==\\" alt=\\"title\\"/></figure>
+<!-- /wp:image -->
+
+<!-- wp:image -->
+<figure class=\\"wp-block-image\\"><img src=\\"data:image/jpeg;base64,/9j/2wBDAAMCAgICAgMCAgIDAwMDBAYEBAQEBAgGBgUGCQgKCgkICQkKDA8MCgsOCwkJDRENDg8QEBEQCgwSExIQEw8QEBD/yQALCAABAAEBAREA/8wABgAQEAX/2gAIAQEAAD8A0s8g/9k=\\" alt=\\"title\\"/></figure>
+<!-- /wp:image -->"
+`;
+
+exports[`Block transforms correctly transform block Gallery in fixture core__gallery__columns into the Image block 1`] = `
+"<!-- wp:image -->
+<figure class=\\"wp-block-image\\"><img src=\\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==\\" alt=\\"title\\"/></figure>
+<!-- /wp:image -->
+
+<!-- wp:image -->
+<figure class=\\"wp-block-image\\"><img src=\\"data:image/jpeg;base64,/9j/2wBDAAMCAgICAgMCAgIDAwMDBAYEBAQEBAgGBgUGCQgKCgkICQkKDA8MCgsOCwkJDRENDg8QEBEQCgwSExIQEw8QEBD/yQALCAABAAEBAREA/8wABgAQEAX/2gAIAQEAAD8A0s8g/9k=\\" alt=\\"title\\"/></figure>
+<!-- /wp:image -->"
+`;
+
 exports[`Block transforms correctly transform block Heading in fixture core__heading__h2 into the Paragraph block 1`] = `
 "<!-- wp:paragraph -->
 <p>A picture is worth a thousand words, or so the saying goes</p>
@@ -32,6 +76,202 @@ exports[`Block transforms correctly transform block Heading in fixture core__hea
 <!-- /wp:quote -->"
 `;
 
+exports[`Block transforms correctly transform block Image in fixture core__image into the Cover block 1`] = `
+"<!-- wp:cover {\\"url\\":\\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==\\"} -->
+<div class=\\"wp-block-cover has-background-dim\\" style=\\"background-image:url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==)\\"><div class=\\"wp-block-cover__inner-container\\"><!-- wp:paragraph {\\"align\\":\\"center\\",\\"placeholder\\":\\"Write title…\\",\\"fontSize\\":\\"large\\"} -->
+<p style=\\"text-align:center\\" class=\\"has-large-font-size\\"></p>
+<!-- /wp:paragraph --></div></div>
+<!-- /wp:cover -->"
+`;
+
+exports[`Block transforms correctly transform block Image in fixture core__image into the File block 1`] = `
+"<!-- wp:file {\\"href\\":\\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==\\"} -->
+<div class=\\"wp-block-file\\"><a href=\\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==\\" class=\\"wp-block-file__button\\" download>Download</a></div>
+<!-- /wp:file -->"
+`;
+
+exports[`Block transforms correctly transform block Image in fixture core__image into the Gallery block 1`] = `
+"<!-- wp:gallery {\\"ids\\":[]} -->
+<ul class=\\"wp-block-gallery columns-0 is-cropped\\"></ul>
+<!-- /wp:gallery -->"
+`;
+
+exports[`Block transforms correctly transform block Image in fixture core__image into the Media & Text block 1`] = `
+"<!-- wp:media-text {\\"mediaType\\":\\"image\\"} -->
+<div class=\\"wp-block-media-text alignwide\\"><figure class=\\"wp-block-media-text__media\\"><img src=\\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==\\" alt=\\"\\"/></figure><div class=\\"wp-block-media-text__content\\"><!-- wp:paragraph {\\"placeholder\\":\\"Content…\\",\\"fontSize\\":\\"large\\"} -->
+<p class=\\"has-large-font-size\\"></p>
+<!-- /wp:paragraph --></div></div>
+<!-- /wp:media-text -->"
+`;
+
+exports[`Block transforms correctly transform block Image in fixture core__image__attachment-link into the Cover block 1`] = `
+"<!-- wp:cover {\\"url\\":\\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==\\"} -->
+<div class=\\"wp-block-cover has-background-dim\\" style=\\"background-image:url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==)\\"><div class=\\"wp-block-cover__inner-container\\"><!-- wp:paragraph {\\"align\\":\\"center\\",\\"placeholder\\":\\"Write title…\\",\\"fontSize\\":\\"large\\"} -->
+<p style=\\"text-align:center\\" class=\\"has-large-font-size\\"></p>
+<!-- /wp:paragraph --></div></div>
+<!-- /wp:cover -->"
+`;
+
+exports[`Block transforms correctly transform block Image in fixture core__image__attachment-link into the File block 1`] = `
+"<!-- wp:file {\\"href\\":\\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==\\"} -->
+<div class=\\"wp-block-file\\"><a href=\\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==\\" class=\\"wp-block-file__button\\" download>Download</a></div>
+<!-- /wp:file -->"
+`;
+
+exports[`Block transforms correctly transform block Image in fixture core__image__attachment-link into the Gallery block 1`] = `
+"<!-- wp:gallery {\\"ids\\":[]} -->
+<ul class=\\"wp-block-gallery columns-0 is-cropped\\"></ul>
+<!-- /wp:gallery -->"
+`;
+
+exports[`Block transforms correctly transform block Image in fixture core__image__attachment-link into the Media & Text block 1`] = `
+"<!-- wp:media-text {\\"mediaType\\":\\"image\\"} -->
+<div class=\\"wp-block-media-text alignwide\\"><figure class=\\"wp-block-media-text__media\\"><img src=\\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==\\" alt=\\"\\"/></figure><div class=\\"wp-block-media-text__content\\"><!-- wp:paragraph {\\"placeholder\\":\\"Content…\\",\\"fontSize\\":\\"large\\"} -->
+<p class=\\"has-large-font-size\\"></p>
+<!-- /wp:paragraph --></div></div>
+<!-- /wp:media-text -->"
+`;
+
+exports[`Block transforms correctly transform block Image in fixture core__image__center-caption into the Cover block 1`] = `
+"<!-- wp:cover {\\"url\\":\\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==\\",\\"align\\":\\"center\\"} -->
+<div class=\\"wp-block-cover aligncenter has-background-dim\\" style=\\"background-image:url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==)\\"><div class=\\"wp-block-cover__inner-container\\"><!-- wp:paragraph {\\"align\\":\\"center\\",\\"placeholder\\":\\"Write title…\\",\\"fontSize\\":\\"large\\"} -->
+<p style=\\"text-align:center\\" class=\\"has-large-font-size\\"></p>
+<!-- /wp:paragraph --></div></div>
+<!-- /wp:cover -->"
+`;
+
+exports[`Block transforms correctly transform block Image in fixture core__image__center-caption into the File block 1`] = `
+"<!-- wp:file {\\"href\\":\\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==\\"} -->
+<div class=\\"wp-block-file\\"><a href=\\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==\\">Give it a try. Press the \\"really wide\\" button on the image toolbar.</a><a href=\\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==\\" class=\\"wp-block-file__button\\" download>Download</a></div>
+<!-- /wp:file -->"
+`;
+
+exports[`Block transforms correctly transform block Image in fixture core__image__center-caption into the Gallery block 1`] = `
+"<!-- wp:gallery {\\"ids\\":[],\\"align\\":\\"center\\"} -->
+<ul class=\\"wp-block-gallery aligncenter columns-0 is-cropped\\"></ul>
+<!-- /wp:gallery -->"
+`;
+
+exports[`Block transforms correctly transform block Image in fixture core__image__center-caption into the Media & Text block 1`] = `
+"<!-- wp:media-text {\\"mediaType\\":\\"image\\"} -->
+<div class=\\"wp-block-media-text alignwide\\"><figure class=\\"wp-block-media-text__media\\"><img src=\\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==\\" alt=\\"\\"/></figure><div class=\\"wp-block-media-text__content\\"><!-- wp:paragraph {\\"placeholder\\":\\"Content…\\",\\"fontSize\\":\\"large\\"} -->
+<p class=\\"has-large-font-size\\"></p>
+<!-- /wp:paragraph --></div></div>
+<!-- /wp:media-text -->"
+`;
+
+exports[`Block transforms correctly transform block Image in fixture core__image__custom-link into the Cover block 1`] = `
+"<!-- wp:cover {\\"url\\":\\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==\\"} -->
+<div class=\\"wp-block-cover has-background-dim\\" style=\\"background-image:url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==)\\"><div class=\\"wp-block-cover__inner-container\\"><!-- wp:paragraph {\\"align\\":\\"center\\",\\"placeholder\\":\\"Write title…\\",\\"fontSize\\":\\"large\\"} -->
+<p style=\\"text-align:center\\" class=\\"has-large-font-size\\"></p>
+<!-- /wp:paragraph --></div></div>
+<!-- /wp:cover -->"
+`;
+
+exports[`Block transforms correctly transform block Image in fixture core__image__custom-link into the File block 1`] = `
+"<!-- wp:file {\\"href\\":\\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==\\"} -->
+<div class=\\"wp-block-file\\"><a href=\\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==\\" class=\\"wp-block-file__button\\" download>Download</a></div>
+<!-- /wp:file -->"
+`;
+
+exports[`Block transforms correctly transform block Image in fixture core__image__custom-link into the Gallery block 1`] = `
+"<!-- wp:gallery {\\"ids\\":[]} -->
+<ul class=\\"wp-block-gallery columns-0 is-cropped\\"></ul>
+<!-- /wp:gallery -->"
+`;
+
+exports[`Block transforms correctly transform block Image in fixture core__image__custom-link into the Media & Text block 1`] = `
+"<!-- wp:media-text {\\"mediaType\\":\\"image\\"} -->
+<div class=\\"wp-block-media-text alignwide\\"><figure class=\\"wp-block-media-text__media\\"><img src=\\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==\\" alt=\\"\\"/></figure><div class=\\"wp-block-media-text__content\\"><!-- wp:paragraph {\\"placeholder\\":\\"Content…\\",\\"fontSize\\":\\"large\\"} -->
+<p class=\\"has-large-font-size\\"></p>
+<!-- /wp:paragraph --></div></div>
+<!-- /wp:media-text -->"
+`;
+
+exports[`Block transforms correctly transform block Image in fixture core__image__custom-link-class into the Cover block 1`] = `
+"<!-- wp:cover {\\"url\\":\\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==\\"} -->
+<div class=\\"wp-block-cover has-background-dim\\" style=\\"background-image:url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==)\\"><div class=\\"wp-block-cover__inner-container\\"><!-- wp:paragraph {\\"align\\":\\"center\\",\\"placeholder\\":\\"Write title…\\",\\"fontSize\\":\\"large\\"} -->
+<p style=\\"text-align:center\\" class=\\"has-large-font-size\\"></p>
+<!-- /wp:paragraph --></div></div>
+<!-- /wp:cover -->"
+`;
+
+exports[`Block transforms correctly transform block Image in fixture core__image__custom-link-class into the File block 1`] = `
+"<!-- wp:file {\\"href\\":\\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==\\"} -->
+<div class=\\"wp-block-file\\"><a href=\\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==\\" class=\\"wp-block-file__button\\" download>Download</a></div>
+<!-- /wp:file -->"
+`;
+
+exports[`Block transforms correctly transform block Image in fixture core__image__custom-link-class into the Gallery block 1`] = `
+"<!-- wp:gallery {\\"ids\\":[]} -->
+<ul class=\\"wp-block-gallery columns-0 is-cropped\\"></ul>
+<!-- /wp:gallery -->"
+`;
+
+exports[`Block transforms correctly transform block Image in fixture core__image__custom-link-class into the Media & Text block 1`] = `
+"<!-- wp:media-text {\\"mediaType\\":\\"image\\"} -->
+<div class=\\"wp-block-media-text alignwide\\"><figure class=\\"wp-block-media-text__media\\"><img src=\\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==\\" alt=\\"\\"/></figure><div class=\\"wp-block-media-text__content\\"><!-- wp:paragraph {\\"placeholder\\":\\"Content…\\",\\"fontSize\\":\\"large\\"} -->
+<p class=\\"has-large-font-size\\"></p>
+<!-- /wp:paragraph --></div></div>
+<!-- /wp:media-text -->"
+`;
+
+exports[`Block transforms correctly transform block Image in fixture core__image__custom-link-rel into the Cover block 1`] = `
+"<!-- wp:cover {\\"url\\":\\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==\\"} -->
+<div class=\\"wp-block-cover has-background-dim\\" style=\\"background-image:url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==)\\"><div class=\\"wp-block-cover__inner-container\\"><!-- wp:paragraph {\\"align\\":\\"center\\",\\"placeholder\\":\\"Write title…\\",\\"fontSize\\":\\"large\\"} -->
+<p style=\\"text-align:center\\" class=\\"has-large-font-size\\"></p>
+<!-- /wp:paragraph --></div></div>
+<!-- /wp:cover -->"
+`;
+
+exports[`Block transforms correctly transform block Image in fixture core__image__custom-link-rel into the File block 1`] = `
+"<!-- wp:file {\\"href\\":\\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==\\"} -->
+<div class=\\"wp-block-file\\"><a href=\\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==\\" class=\\"wp-block-file__button\\" download>Download</a></div>
+<!-- /wp:file -->"
+`;
+
+exports[`Block transforms correctly transform block Image in fixture core__image__custom-link-rel into the Gallery block 1`] = `
+"<!-- wp:gallery {\\"ids\\":[]} -->
+<ul class=\\"wp-block-gallery columns-0 is-cropped\\"></ul>
+<!-- /wp:gallery -->"
+`;
+
+exports[`Block transforms correctly transform block Image in fixture core__image__custom-link-rel into the Media & Text block 1`] = `
+"<!-- wp:media-text {\\"mediaType\\":\\"image\\"} -->
+<div class=\\"wp-block-media-text alignwide\\"><figure class=\\"wp-block-media-text__media\\"><img src=\\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==\\" alt=\\"\\"/></figure><div class=\\"wp-block-media-text__content\\"><!-- wp:paragraph {\\"placeholder\\":\\"Content…\\",\\"fontSize\\":\\"large\\"} -->
+<p class=\\"has-large-font-size\\"></p>
+<!-- /wp:paragraph --></div></div>
+<!-- /wp:media-text -->"
+`;
+
+exports[`Block transforms correctly transform block Image in fixture core__image__media-link into the Cover block 1`] = `
+"<!-- wp:cover {\\"url\\":\\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==\\"} -->
+<div class=\\"wp-block-cover has-background-dim\\" style=\\"background-image:url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==)\\"><div class=\\"wp-block-cover__inner-container\\"><!-- wp:paragraph {\\"align\\":\\"center\\",\\"placeholder\\":\\"Write title…\\",\\"fontSize\\":\\"large\\"} -->
+<p style=\\"text-align:center\\" class=\\"has-large-font-size\\"></p>
+<!-- /wp:paragraph --></div></div>
+<!-- /wp:cover -->"
+`;
+
+exports[`Block transforms correctly transform block Image in fixture core__image__media-link into the File block 1`] = `
+"<!-- wp:file {\\"href\\":\\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==\\"} -->
+<div class=\\"wp-block-file\\"><a href=\\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==\\" class=\\"wp-block-file__button\\" download>Download</a></div>
+<!-- /wp:file -->"
+`;
+
+exports[`Block transforms correctly transform block Image in fixture core__image__media-link into the Gallery block 1`] = `
+"<!-- wp:gallery {\\"ids\\":[]} -->
+<ul class=\\"wp-block-gallery columns-0 is-cropped\\"></ul>
+<!-- /wp:gallery -->"
+`;
+
+exports[`Block transforms correctly transform block Image in fixture core__image__media-link into the Media & Text block 1`] = `
+"<!-- wp:media-text {\\"mediaType\\":\\"image\\"} -->
+<div class=\\"wp-block-media-text alignwide\\"><figure class=\\"wp-block-media-text__media\\"><img src=\\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg==\\" alt=\\"\\"/></figure><div class=\\"wp-block-media-text__content\\"><!-- wp:paragraph {\\"placeholder\\":\\"Content…\\",\\"fontSize\\":\\"large\\"} -->
+<p class=\\"has-large-font-size\\"></p>
+<!-- /wp:paragraph --></div></div>
+<!-- /wp:media-text -->"
+`;
+
 exports[`Block transforms correctly transform block List in fixture core__list__ul into the Paragraph block 1`] = `
 "<!-- wp:paragraph -->
 <p>Text &amp; Headings</p>
@@ -64,6 +304,36 @@ exports[`Block transforms correctly transform block List in fixture core__list__
 <!-- /wp:quote -->"
 `;
 
+exports[`Block transforms correctly transform block Media & Text in fixture core__media-text into the Image block 1`] = `
+"<!-- wp:image -->
+<figure class=\\"wp-block-image\\"><img src=\\"data:image/jpeg;base64,/9j/2wBDAAMCAgICAgMCAgIDAwMDBAYEBAQEBAgGBgUGCQgKCgkICQkKDA8MCgsOCwkJDRENDg8QEBEQCgwSExIQEw8QEBD/yQALCAABAAEBAREA/8wABgAQEAX/2gAIAQEAAD8A0s8g/9k=\\" alt=\\"\\"/></figure>
+<!-- /wp:image -->"
+`;
+
+exports[`Block transforms correctly transform block Media & Text in fixture core__media-text__image-alt-no-align into the Image block 1`] = `
+"<!-- wp:image -->
+<figure class=\\"wp-block-image\\"><img src=\\"data:image/jpeg;base64,/9j/2wBDAAMCAgICAgMCAgIDAwMDBAYEBAQEBAgGBgUGCQgKCgkICQkKDA8MCgsOCwkJDRENDg8QEBEQCgwSExIQEw8QEBD/yQALCAABAAEBAREA/8wABgAQEAX/2gAIAQEAAD8A0s8g/9k=\\" alt=\\"my alt\\"/></figure>
+<!-- /wp:image -->"
+`;
+
+exports[`Block transforms correctly transform block Media & Text in fixture core__media-text__is-stacked-on-mobile into the Video block 1`] = `
+"<!-- wp:video -->
+<figure class=\\"wp-block-video\\"><video controls src=\\"data:video/mp4;base64,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\\"></video></figure>
+<!-- /wp:video -->"
+`;
+
+exports[`Block transforms correctly transform block Media & Text in fixture core__media-text__media-right-custom-width into the Video block 1`] = `
+"<!-- wp:video -->
+<figure class=\\"wp-block-video\\"><video controls src=\\"data:video/mp4;base64,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\\"></video></figure>
+<!-- /wp:video -->"
+`;
+
+exports[`Block transforms correctly transform block Media & Text in fixture core__media-text__video into the Video block 1`] = `
+"<!-- wp:video -->
+<figure class=\\"wp-block-video\\"><video controls src=\\"data:video/mp4;base64,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\\"></video></figure>
+<!-- /wp:video -->"
+`;
+
 exports[`Block transforms correctly transform block Paragraph in fixture core__paragraph__align-right into the Heading block 1`] = `
 "<!-- wp:heading -->
 <h2>... like this one, which is separate from the above and right aligned.</h2>
@@ -181,3 +451,25 @@ exports[`Block transforms correctly transform block Verse in fixture core__verse
 <p>A <em>verse</em>…<br>And more!</p>
 <!-- /wp:paragraph -->"
 `;
+
+exports[`Block transforms correctly transform block Video in fixture core__video into the Cover block 1`] = `
+"<!-- wp:cover {\\"url\\":\\"data:video/mp4;base64,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\\",\\"backgroundType\\":\\"video\\"} -->
+<div class=\\"wp-block-cover has-background-dim\\"><video class=\\"wp-block-cover__video-background\\" autoplay muted loop src=\\"data:video/mp4;base64,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\\"></video><div class=\\"wp-block-cover__inner-container\\"><!-- wp:paragraph {\\"align\\":\\"center\\",\\"placeholder\\":\\"Write title…\\",\\"fontSize\\":\\"large\\"} -->
+<p style=\\"text-align:center\\" class=\\"has-large-font-size\\"></p>
+<!-- /wp:paragraph --></div></div>
+<!-- /wp:cover -->"
+`;
+
+exports[`Block transforms correctly transform block Video in fixture core__video into the File block 1`] = `
+"<!-- wp:file {\\"href\\":\\"data:video/mp4;base64,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\\"} -->
+<div class=\\"wp-block-file\\"><a href=\\"data:video/mp4;base64,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\\" class=\\"wp-block-file__button\\" download>Download</a></div>
+<!-- /wp:file -->"
+`;
+
+exports[`Block transforms correctly transform block Video in fixture core__video into the Media & Text block 1`] = `
+"<!-- wp:media-text {\\"mediaType\\":\\"video\\"} -->
+<div class=\\"wp-block-media-text alignwide\\"><figure class=\\"wp-block-media-text__media\\"><video controls src=\\"data:video/mp4;base64,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\\"></video></figure><div class=\\"wp-block-media-text__content\\"><!-- wp:paragraph {\\"placeholder\\":\\"Content…\\",\\"fontSize\\":\\"large\\"} -->
+<p class=\\"has-large-font-size\\"></p>
+<!-- /wp:paragraph --></div></div>
+<!-- /wp:media-text -->"
+`;
diff --git a/packages/e2e-tests/specs/block-transforms.test.js b/packages/e2e-tests/specs/block-transforms.test.js
index 7eae4155ab22fb..098fc777ee357c 100644
--- a/packages/e2e-tests/specs/block-transforms.test.js
+++ b/packages/e2e-tests/specs/block-transforms.test.js
@@ -2,7 +2,6 @@
  * External dependencies
  */
 import {
-	filter,
 	flatMap,
 	map,
 	mapValues,
@@ -96,28 +95,7 @@ const getTransformResult = async ( blockContent, transformName ) => {
 };
 
 describe( 'Block transforms', () => {
-	// Todo: Remove the filter as soon as all fixtures are corrected,
-	// and its direct usage on the editor does not trigger errors.
-	// Currently some fixtures trigger errors (mainly media related)
-	// because when loaded in the editor,
-	// some requests are triggered that have a 404 response.
-	const fileBasenames = filter(
-		getAvailableBlockFixturesBasenames(),
-		( basename ) => (
-			! some(
-				[
-					'core__image',
-					'core__gallery',
-					'core__video',
-					'core__file',
-					'core__media-text',
-					'core__audio',
-					'core__cover',
-				],
-				( exclude ) => basename.startsWith( exclude )
-			)
-		)
-	);
+	const fileBasenames = getAvailableBlockFixturesBasenames();
 
 	const transformStructure = {};
 	beforeAll( async () => {