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You would need to access your form submissions page then delete the submission with file upload from there:
In Form Submissions page: Click "X" button to delete
NOTE: Make sure to have your backup first because once you delete the submission, there is no way you can retrieve it back.
Just found what I needed by selecting a form from My Forms list by the check box to the left of the form. After selecting a new set of buttons appears above the list table, one of which is the Submissions button. Just clicking this button opens the full table of forms submissions. Question answered.
I have the same question as Mike. I see your answer but I can not see where to access the " form submissions page". All I can see with my account is My Forms, http://www.jotform.com/myforms/, but no obvious access to a "form submissions page".
Please let me know how to access my "form submissions page".
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