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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.