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.
If you are trying to update a field value based on an entry in another field, that can be done using conditional logic:
I am not sure what you are referring to by "It's a document". If you wouldn't mind elaborating on what you need done with the document, we will be happy to assist you further.