Created attachment 110804 [details] a girl brushing a dinosaur's tooth Same situation as a commission artist on here a while back. Krita is updated and I've tried every other fix you suggested, but I can't seem to fix this file. It's not urgent, but I really liked where the sketch was going so I was hoping you could help me out?
Sorry, but this is a bug tracker, not a user support forum. I've looked at the file, and it's not a valid zip file. If even ziprepair (https://www.diskinternals.com/zip-repair/, haven't tried that since I'm on linux atm) cannot repair it, it is lost.