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 understand that you want to delete the stored upload files. You can use the auto-delete feature to delete the submissions and uploads : http://apps.jotform.com/app/auto_delete_submissions
If you still have any other questions related to the same issue, please reply to the same thread.
Please be noted that you cannot just delete the uploaded files. You will have to actually delete the submission records of your JotForm. Deleting a submission record will also delete the attached file as well which will free up your upload space usage.
Hope this answers your query.
Do get back to us if you have any questions.