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 checked your form on an Android device and it looks like I am able to upload an image successfully.
I also tested a cloned version of your form and I was able to upload and submit the image without any issues.
Do you still encounter the issue on your end? Which device and browser were you using when you encountered the issue? Please try clearing your browser cache and your form cache then try uploading again.
If the issue persists, please let us know.