I'm pulling friendly URL from COS API for CRM files. I pass them to a webhook that catches them and passes them to Google Drive upload feature in Zapier. Some files transfer perfectly, but some files give me a 403 error. The Google Drive is bound inside of Zapier to the target Google Drive account. Again, it works for most files. I get both PDFs and JPGs to come over fine. When I get a 403 error, I cannot view the CRM Engagement/Attachment file in the COS. It gives the same 403 error (forbidden).
I have read on scoping and such, but the connector in Zapier that binds to Google Drive should negotiate all of that I would think - plus, it works a great deal of the time.