Hi @ ScottR-MT,
The error told that the credentials for the connection do not have access to your folder.
Could you please check whether the connection you have selected is the right one.

Further, if the Username, Password, gateway in your connection is wrong, an error could occur as you. Could you please check the Username, Password, gateway in your connection.
You could refer to screenshots below:

Make sure the Username is configured to “DOMAIN\Username” and the Password is correct.
In addition, make sure the gateway you choose should be an already installed gateway in your computer.
I have made a test on my side, the issue you mentioned doesn’t accur, you could refer to steps below:
- Add a trigger, you could choose trigger ”When a new email arrives” and choose a path in the Folder field, the Has Attachment Filed and Include Attachments Filed both set to Yes.
- Add an Apply to each, choose the Attachments dynamic content of ”When a new email arrives” in the input field.
- Inside the Apply to each, add action “Create file” of “File System” connector, create a connection like me above. choose “File System” in the Folder path field, choose the Name dynamic content of ”When a new email arrives” in the File name field, choose the Content dynamic content of ”When a new email arrives” in the File content field.
Image reference:

When I receive an email with attachment, the flow run successfully as below:

And the attachment has been saved in the Root path “C:\Users\Administrator\Desktop\1\2”
