Had to refund this within 20 minutes, as the most basic functionality was resulting a full page error. I made some simple tweaks. Clicked on Save PDF....error.

Uncaught runtime errors:
×
ERROR
[object Object]
at handleError (https://editor.gopdf.io/static/js/bundle.js:575636:58)
at https://editor.gopdf.io/static/js/bundle.js:575659:7
ERROR
[object Object]
at handleError (https://editor.gopdf.io/static/js/bundle.js:575636:58)
at https://editor.gopdf.io/static/js/bundle.js:575659:7

Then the PDF wasn't even in my files I had to do everything again. If you can't have your stuff together for a simple export function, I can't trust you for a lifetime deal haha. I'm out, requested refund.