Doesn't work in 5.7.3: Need ability to remove specific versions of an attachment

If someone has uploaded a file with the same name as an existing file, it becomes the most recent version. If this last upload needs to be removed, the only way to do it and preserve previous versions is to download all versions of the file, remove the attachement (which deletes all revisions), then re-upload all versions carefully typing in the comments.

It would be very helpful if a specific revision of an attachment could be removed.