On iOS, when I save an image from Safari to the Dropbox app, before saving, the file name shows as a url file (and saves as a URL). I suspect today’s update causes this, because I was able to do this last night.
I long press on an image > share > save to Dropbox
At this step, the expanded menu recognizes the file type is an image, vs me mistaking it for an image, where it could be another file type. I’ve closed Safari, Dropbox and turned my phone off and on, issue persists.