Hi @jim,
The code you’ve provided above is incomplete. Could you let me know where test_pdf_url is coming from?
When I edit the code you’ve provided to use pdf_url rather than test_pdf_url, the code is working for me.
Making some guesses here, it looks like there might be an issue with a temporary file, but without knowing how you’re generating that file, I can’t help you any more than that I’m afraid.