JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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 am not sure if I have understood your question correctly. We have received an empty post from you with just the title as "upload a file".
Do you want to allow users to upload file in your form? Yes it is possible by adding a "File Upload" question in your form. Please check the screenshot below:
Hope this helps.
If you meant to ask something else, do get back to us with your question a little more in detail.