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.
If you want to clear some storage space, then you need to delete the submissions that have uploaded attachments.
In My Forms page, select the form and then click the "Submissions" button.
In the Submissions page, you can click the "Delete" button to remove a single submission or you can use the "Delete All Submissions" button at the Grid report.
Hope that helps. Thank you.