What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
I just checked your form submissions and uploaded files shows fine. Some fields are lefted blank, this sometimes happens when your upload fields aren't set as required, hence your form users can scaped this, which results to a possible blank submissions.
I have sent a sample submissions on your form with an attachments, please recheck if everything is viawable.
If you are still having any difficulties viewing uploaded files, please let us know. Thank you for using JotForm and have a blessed new year!