Yes, this is the complete error in the GUI. See also the attached screenshot.
The error appears with different file types, including as a .jpeg (2MB), an .exe (58MB) and an MP4 (94MB) file. I copied these to my (local) My Drive folder, and Insync tries to upload them to Google Drive and then the error occurs.
I believe you had a brief exchange with @mara via email. She has already reported this to our engineers and we’re waiting for their advise.
At the moment, could you try to upload those files via My Drive web instead of locally? Insync will try to download them instead of uploading. Let me know if this works-- it would help us narrow down the issue if it’s only an upload problem.
This is REALLY annoying. When uploading ANY file (unless it’s a very small one, say < 1MB), I get this error. The only workaround it to manually sync via the web interface of Google Drive, which completely defeats the purpose of this program (and why I bought it in the first place).