I have a sheet with multiple users who share attachments with each other. The first user attaches a template to a specific row that the second user downloads, completes, then adds the completed document as an attachment to the same row.
I want to set up an workflow that will alert the first user that the second user has attached a document. But I don't want the first user to get an alert when they attach their template. Ideally I would like to be able to access the attachment metadata in this workflow to use a condition like "when an attachment is added but not by the first user." The existing Modified By system field does not work as that only tracks changes to the row data - not the addition of attachments.
Has anyone else figured out a way to do this?