also found this on Reddit but it didn’t apply to me. Maybe you? https://www.reddit.com/r/RPGMaker/comments/zwmcjy/mv_headscratcher_when_uploading_package_to_itchio/?utm_source=share&utm_medium=ios_app&utm_name=ioscss&utm_content=1&utm_term=1
Viewing post in Upload error for zip file: context cancelled
I saw that one post and didn't look too much into it as I'd already done some of the steps and it worked before. I guess I'll go a little further into it. Not sure if your method will help much but thanks for responding. It's interesting that most of these seem to be reported in the past few days. I uploaded the project a few days ago and it worked fine and suddenly it's busted. So I'm guessing/hoping you're right that it's an Itch problem.