How to send attached files

We’re using Gravity Forms and have an option for uploading PDFs. I’ve tried using the field name “input_41” for the input name, and I’ve mapped it correctly to the 3rd party, but on the 3rd party side I see that the file never comes over, mapped or otherwise.

I see there is an additional plugin (https://github.com/dmncls/forms-3rdparty-integration-upload) to handle uploaded files, but it looks like it has only been developed for CF7 forms. Is there a plugin for Gravity Forms? Or do I just need to do something different with the input name? Thanks in advance!