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.
Unfortunately, when you are using mobile phone browser to upload, the limitation is being set by the device browser (in this case the phone) -- this is due to capacity limitation of mobile devices.
BUT you can still make your mobile form allow more than one upload at a time by just adding multiple upload fields on it. So, the form user can use each upload field to upload files when they are using mobile browser.
We also recommend using InkFilepicker.io tool if you need upload capability on your form when used on mobile browsers. You can learn more about this in JotForm Apps
Hope this help. Inform us if you need more assistance.