Update custom function

Hi! We are trying to update a custom function that was developed in 2014 and uses form_display.php to pass an uploaded file to our PDF Conversion Server. The GF call has changed since 2014 (of course!). Can someone help me figure out how to tweak the code to get it working again?

Can you share the code that you’re trying to update, and let us know why you need to update the code or what changes are required? Thank you.