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.
If you are mentioning about adding a scanned document to your existent submission, it is possible with hidden "Upload" field. By doing this, users don't see that field, so you can edit their submissions after they submitted.
To make the "Upload" field hidden,
After you set the field and the user submitted, you can edit those submissions by following steps from the below:
For further assistance, please do let us know.