Which version are you using?
I am on version 3.30.8, installed from F-Droid, and have similar problems. It helps if you restart the phone. Restart until all files have been uploaded.
But I found out that sometimes not all files are uploaded, although the app says āall uploadedā. And then you can manually find out which files are missing and upload them manually.
Iāve been working with it for many years now, but time and time again errors occur and iām getting tired of dealing with them.