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.
To confirm, you are referring to the "upload space" that is allocated to your account?
If that is the case, the is filled by any files that are uploaded on your forms.
If any of the limits are reached on your account (Upload Space, SSL submissions, payment submissions or regular submissions) your forms will be disabled.
To free up your upload space, you would delete submissions from your submissions page, that will delete any files that have been uploaded with that submission.
I hope this helps, please inform us if you need further assistance.