JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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Can you please confirm that what you wanted to do is delete submissions that have uploaded files?
If it is, you can also use the Search and Delete APP to search and delete specific submissions in your jotform.
Check it here : http://apps.jotform.com/app/search_and_delete
Hope this help. Inform us if you need further assistance.