AP Email Processing from Gmail - some emails skipped

We have AP document handling set up. We use a Gmail account for vendors to send invoices.

Originally we had Acumatica set up to read directly from the gmail inbox. But, we intermittently got RSC datetime format errors. When we got these errors Acumatica would error and not read any emails. Acumatica support directed us to set up a gmail folder and point Acumatica to that folder. Since gmail doesn’t have folders, we added a label, via gmail filters labeled all incoming email with an attachment with that label, and pointed Acumatica to that label using the folder setting. This change resolved the datetime format error.

Our vendors usually send invoices in batches - each invoice in its own email. Acumatica only reads the most recent email from each vendor; the other emails remain in gmail as unread. (This problem existed prior to the label change as well). This problem appears to only exist for each batch.

We are on Acumatica version 24R1, use IMAP and Oauth to connect to our gmail account.

How can I get Acumatica to read all emails? What is the root cause of this problem?

Any insights or suggestions would be greatly appreciated, particularly from others who might have encountered similar issues with Gmail integration.