This may sound strange, but I was running into this same issue. I read somewhere to try a different gpt. So I clicked on explore gpt’s in the sidebar of the desktop app on my macbook. Specifically, I’m creating content for Canvas so I chose the gpt, Canvas LMS. Then a separate explorer window popped up. Using the same commands as before to no avail, this gpt was able to create files and downloadable links. For redundancy, I went back and ran the same gpt with the same command, and got the same error again. So, for some reason, it only works in the explorer window. Super strange, but a workaround that worked in case anyone is interested.