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.
Can you please give us more details about the issue. Is your form embedded on a website?
If it is, can you share to us the URL of your website were the form was used.
I tested your form http://www.jotform.co/form/33238137851859 on an Iphone emulator and was able to upload and submit images.
As a suggestion, since you intend your form to for mobile use you should also add a ink-filepicker tool to allow uploading of files form mobile device.
You can read for more details here How-to-Take-Pictures-on-Your-Forms
Please update us.