How to show the hidden fields in a submission to edit by reviewer?

I have hidden comment fields on the form which I intend to use when the responder submits the document. How can I access the hidden field on the submitted document so I can make the necessary comments in the response?

I understand that you want to edit the submission received to add comments. To achieve this requirement, you may place a text box as shown below to enter a secret code which will be known to the reviewer.

Based on the code entered we can show the hidden fields by using a condition.

You may place the Submission edit link in the notification email so that the form receiving person can directly open the submission from the email to edit it.

Here is the cloned version of your JotForm with the above changes.

https://form.jotform.com/61241387090957

Please check and feel free to clone it to your account to see how it works.

Hope this information helps! Please get back to us if you need any further assistance. We will be happy to help.