Hi @Doug Parkhouse ,
I'm using the SharePoint Server 2016 On-Premise, configured on-premise data gateway.
If using Copy file action, it will also meet the same error:
If I use Copy file (deprecated), then it's working to copy file in On-Premise environment:
![34446-snipaste-2020-10-23-15-21-26.png][2]
![34460-snipaste-2020-10-23-15-29-28.png][4]
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[2]: /api/attachments/34446-snipaste-2020-10-23-15-21-26.png?platform=QnA [4]: /api/attachments/34460-snipaste-2020-10-23-15-29-28.png?platform=QnA