Mobile: Inconsistency when replacing media on cover block

[mchowning]

What problem does this address?

On the mobile apps, the flows for replacing media on the cover block are inconsistent between videos and images. In particular, with images, the most straightforward way to replace the media is by tapping on the edit icon on the top right of the cover block.

Image	After clicking the edit icon

When the cover block is displaying a video, however, that option is not available.

Instead, you must follow a far more indirect route:

1. Tap the block settings "cog"	2. Clear the media	3. Add the new media to the (now-empty block) by either (a) tapping the now-present edit icon in the top-right, or (b) tapping the cog a second time to get the "Add image or video option"

And then proceed to add a new media item to the now-empty cover block.

What is your proposed solution?

I think we should include the add media button in the top right of the block when either a video or image is being displayed, not just when an image is being displayed. For videos it shouldn't have the edit option (since we don't have the ability to edit videos currently), so it should probably just directly open the replace modal since that would be the only option.