JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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.
For each submission, the form can handle up to 1 GB of total file size upload. You can adjust the maximum file size by following this guide: https://www.jotform.com/help/33-Changing-the-upload-size-limit
However, please note that each account type also has a upload storage limit. For "Free" plan, you are allowed to have a total of 100 MB of upload space. You can check our pricing page for the difference of each plan. So if your user uploaded a file of 500 MB, then your account will already exceed your limit, when you exceed this limit, all of your forms will temporarily be disabled. You need to free up your upload space by deleting submissions with file uploads on them or you can simply upgrade to a higher subscription plan with a higher upload space limit.
I hope that helps.