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.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
I have checked your form and found that you have entered jpg extension for two times.You can remove one to slove the problem.
Please see the image below.
You can also validate your image by enabled it.
Please get back to us if you need further assistance.
That is how i managed a problem when i put it one more time at the end.
I tested your form and it is uploading jpg with no problem:
If you need further support please let us know.