Having issues submitting a form

I recently created a scholarship application template through JotForm and it seemed to be working great. A few hours before the deadline, one person reached out to say he was unable to submit the form. Every time he tried, he got a message saying his form may not have been saved and I have no record of it on my end.

Is there something I could suggest to him that he may have done incorrectly? I wondered if he might have left out a required field, or tried to upload too large of a file (I asked for a photo to be uploaded with each one), although I would have thought that would have given a different error message.

He was the only person to contact me with issues and we had more than 100 submissions, so it makes me think it was a user issue, not a form issue. I'm just wondering if you have some suggestions of what I could ask him to try.

Thanks!

Is this the form your user had issues with http://www.jotform.us/form/53514537925157?

Considering that your form is currently unavailable, I have cloned your form and I made test submission on my cloned form. I was not able to replicate mentioned issue. Form is working properly. 

Was your form maybe embedded? If so can you provide us URL of your webpage, so that we can test your form. 

If only one user reported this issue, most likely issue is related to device or browser that user was using. You can suggest to that user to try with a different browser or to try to submit the form on a different device . You can also ask for a screenshot of error message that was shown. You can then upload a screenshot of error message here. 

Let us know if you need further assistance.