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.
It seems that the files uploaded are not encrypted as the data received on other input fields. You'll be prompted to upload the key in order to view the submissions.
Please note that the submissions cannot be viewed from your account unless the right-key is uploaded.
Let me forward the issue to our back-end team if this can be implemented. I cannot guarantee that the feature will be implemented or any time frame at the moment for implement. However, you'll be posted through this thread once we have any update on this.