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.
I understand that you want to delete the uploaded files through your JotForm submissions. If so, please be noted that it is required to delete the submission from the submissions view in order to clear the upload space. Please make sure that you are backing up your submissions along with the uploaded files before you delete them from your form since the submissions once deleted cannot be retrieved in any way.
Hope this information helps!