What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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I cloned your form and tried to create the PDF form. I was able to replicate the issue on my end. Whenever I create the PDF form, it just keeps loading and gets stuck to "Working". I also tried on different forms and the issue persists.
I will forward this issue to our backend team for further investigation. We will let you know on this thread if there are any updates. Regards.