I have a Zap which looks for new emails in an inbox folder every 2 minutes.
Once these are assigned a category they’re passed on for further actions.

When I manually trigger it this works, however it seems to no work intermittantly when run automatically.
Could it be that the filter looking for a category considers the email old if it’s found within one tick cycle without a category? So it’s failing to pass on the email for additional actions within the Zap?
