I have a report from a user that https://commons.wikimedia.org/wiki/File:Chiesetta_a_Fénis_1.JPG and https://commons.wikimedia.org/wiki/File:Castello_Jocteau_5.JPG were actually two images each (for unknown reasons), but uploading a reverted (non-current) version under a new title failed, presumably being considered a reupload/duplicate by unauthorised user.
When I tried with the UW I got an unknown error in the first step but normal upload worked: https://commons.wikimedia.org/wiki/File:Chiesetta a Fénis 2.JPG, https://commons.wikimedia.org/wiki/File:Castello_Jocteau_7.JPG .
- Upload two files A and B
- Expect they are uploaded as files A and B
- Find that A is uploaded as A, then B is uploaded with A's title (as a new version)
- Try to upload A under a non-A title (or B with its own title after reverting A's title to A file)
- Find that you can't upload the file, or history gets lost in the process, or both