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.
Thank you for contacting us. JotForm's upload feature have a maximum file size limit of only 1GB per upload session. This means that if your form user is attempting to upload a file size of 1.5GB, the upload session will fail at once.
More about upload size limit you can read in this article:
Hope this will help. Let us know if you need further assistance.