I do agree perhaps someone would want a simple file uploader or a reference to a URL or file/media library image instead. This wouldn't be a simple thing to implement though as essentially the multi-uploader field would need to be modified to also allow selection of a gallery. Then we use that field in the cms download screen.

v11.0 is pretty-much feature locked at this point so this may be something to consider for 11.1 or later.

Also, creating a gallery for what might be a single image seems a bit daft. 11.1 works.

Yeah I figure a vast majority of downloads will have either 0 or 1 images, so a gallery is overkill.