Build upload error

Published base game (v0.1) to App Lab with no issues, now tried to upload an update (0.2) after building, and on trying to upload to the Beta (or indeed any) channel on Unity Hub I simply get a very generic error “The build you were trying to upload has failed. Build Upload Error - an error has occured for app id: xxxxxxx” - How can I find out what the problem is??? There are no errors or warnings on the console after the build, also tried a clean build with the same result.
Is there a log I can find to give some indication why it won’t upload?

I’ve run into the same issue. Did you ever find a solution?
I tried uninstalling and reinstalling MQDH, to no avail.