Possibility to fill out caption before image upload

[ellatrix]

Sometimes, I'd like to write a page and lay it out before uploading images. It would be nice if I could fill out caption in image placeholders before uploading the images. It also lets me remember what to upload as the caption is a clue.

I realise this may conflict with inserting an image from the media library that already has a caption, but imo the caption written in the block should then be kept.

[ellatrix]

Cc @mtias

[ellatrix]

To be honest, we currently have logic in place that overrides the user written caption with the media library caption if you replace the image. This is wrong. We shouldn't discard the caption?

[draganescu]

I clearly remember working on the gallery block for preserving the captions in the editor. I think the idea was:

• caption in editor are not replaced by captions in the media library
• empty captions in the editor are replaced by captions in the media library
• captions in the editor can be replaced by captions in the media library if they're edited before image is inserted (replaced)