Special:Badtitle/NS90:File talk:Flag of the United States.svg/This image does not thumbnail properly./reply

Wikimedia Commons seems to have shuffled some images around again. If you need to, upload a local copy, then check what links to the original image and fix the links.

If it says the file is already uploaded, just tell it to ignore any warning on upload, apply a license template just be on the prudent side.