PDF generation error when uploading background pdf for first template

Hi,
I'm creating a site for a fundraising effort and part of it is the registration to an event. Your plugin is perfect for this. It's the first time I use it, so I might be messing up on different places at the same time. (sorry)
I created a form with divi, and when I try to create the first template, the pdf I made for the background doesn't upload and gives back "PDF generation error".
The pdf was made with Canva (that could be a problem?). I tested with both versions, normal and print. Both give the same error.
I'm using Brave browser, so I switched to Firefox and it also gives the same error.
The site is very simple as it's new and has very few plugins.
Any help would be highly appreciated. :)

Hi,
it works!! Thanks soo much!!