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.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
I've tried cloning your JotForm to my account and it seems to be working fine without any issue. It seems that the issue with the upload field on your JotForm or the form itself. Could you try removing the upload file and add it again to see if that helps? Also, please try cloning the form to your account and check if that works.
Please let us know if the issue still persists. We will be happy to look into this issue further.