When I want to sync to my spreadsheet or to Docs, I got the notification "Authorization at Google failed". No error code was mentioned. But when I tap on the error message, I got directed to a broken page of Google, since their UI has changed. I suspect this synchronization error is caused by the new UI of Google.
After I removed Memoires from the allowed Google apps to see if re-adding helps, I did not get a new message to re-authorize again (unlike shown in your video tutorial).
Do other users also have this problem? Any ideas how to solve this?