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 no exact method to achieve this using the form builder alone.
As is, what you can do at the moment is use unique submission
but will limit the current users to using the form only once -- you have to manually activate the form to allow access again.
You may also like to check on this article -How-to-setup-folders-using-UniqueID-in-Dropbox
You can setup the integration to Dropbox to have unique repository(folder) instead, if the objective is to track unique file uploaded in the form of the user.
Hope this help. Inform us if you need further assistance.