How can I set my form in Contact Form 7 to allow unlimited uploads?

How can I set my form in Contact Form 7 to allow unlimited uploads? I'd like to be able to do this with a button that says "Add another Content Submission " or something like that. Then when the button is clicked another form to upload another submission appears. Then when all their submission files are uploaded and showing, then they can click "Submit" at the end of the form after checking the required boxes of course. You can see the form I am looking to do this with at http://www.musicandmedianetwork.com/submissions/

Thank you! :slight_smile: