Receiving the following repeating Gmail error message during every Outlook session: [ALERT] Message too large. https://support.google.com/mail/answer/6584#limit

I contacted Google/gmail and was told the issue is with Outlook.

Another Mac user posed a similar question on this forum. I followed the advice recommended to fix their problem: select Window on the main menu bar then select Progress. My Progress list is empty so I'm unable to find the offending large message to delete it. Thanks in advance!