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Please provide us more details about the upload error you encountered.
I made a test submission using your form in your website http://www.swurvradio.com/hookup/
and I was able to upload the cover and mp3 song successfully as I was able to see the Thank You page
If issues persist, please try also re-embedding the form using its iframe embed code instead of the script code
Follow this user guide to get the iframe embed
Hope this help. Inform us if you require further assistance.