Seeking an Appgyver expert - Need help with Upload File function and sending POST request to WP media library

Hello! Seeking someone to assist me with an Appgyver challenge. I'm trying to use the 'upload files' function to create a POST request to the WP media library, but keep running into a 'Content-Disposition' error. I may not be doing this correctly as I haven't tried uploading like this before.

If you're an Appgyver expert and can give me an hour of your time to set this up, I'd appreciate it!