If you copy metadata from the first file to the remaining files, but forget to uncheck the title field, there doesn't appear to be any way to undo the mistake. This can make an upload of dozens of files suddenly worthless as you can't tell which file was which anymore.
Related Gerrit Patches:
|mediawiki/extensions/UploadWizard : master||Implement ability to undo copying metadata|
|Open||None||T116510 Batch video upload tracking bug|
|Resolved||matmarex||T116513 No way to undo overwriting of filenames after 'copy'ing title from first to (2nd...18th...etc) later files|