This idea has been merged into another idea. To comment or vote on this idea, please visit LATER-I-294 replace the image in a scheduled post.
We need to be able to replace the image in a scheduled post, in case we make a mistake and don't want to delete the whole post, or so we can schedule with placeholder images while we wait to get the actual image we need.
There is no reason I can see not to allow this. Until the post is, well, posted, it's just sitting on your server as a draft, essentially. Why can we go in and edit the image or crop the image, and edit the text, but we can't replace the image?