Currently all uploading tools, except cross-wiki, has a page where they get to chose form "is this from the web, your own, etc." or "which license and source does this image have"? Cross-wiki choses another approach, which is borderline dangerous and reckless for the Commons comunity, who has to clean up this mess.
Cross-wiki only allows users to choose "Own work" and the license "CC-by-sa 4.0", not even offerering a drop down menue for either of these things, or a blank field text box.