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.
There is a maximum. Maximum is 1 GB per file. Inside of this guide you can find how to change the file upload size limit:
However I saw that your account is free and total available space for free accounts is 100 MB. You can upgrade your account to increase total available space of your account. More about different account types you can find on our pricing page.
Also this guide may help you to create file upload form:
Hope this will help. Let us know if you need further assistance.