We have an image block with an image property that is required, so when you add an image block to a content area you would like to choose an image that the block should show.
As is now you can only choose an image from an existing folder in the media library and For All Sites. There is no For this page or For this block folder available.
We would like to make it possible to upload an image that is exclusively usable for just that block. We don't want to force the editor to take extra steps that would be to first create the block and then edit the block and add an image under the now created For this block folder.