Form Save vs Submit

Disclaimer: I am new to Jot Form.

I have a form that has both required and optional fields.  It is a lengthy form and it would be nice to be able to allow users to "save" their work before submitting the form to us.

I know there is an edit link option but all the required fields need to be completed before the form can be submitted.  I looked at the "auto-fill" feature and that may work but has limitation in that files marked to be uploaded are lost when the user revisits the form.

Is there a way for a user to to save a form in progress with required fields that have not been filled in so they can continue to work on the form over time rather than complete it all once?

Thanks.

We also have a session based save and continue:

https://www.jotform.com/help/227-how-to-enable-autofill-on-forms/

This does also have the same limitation with file upload fields as the auto-fill feature when it comes to file uploads. When returning to the form, users would need to upload files once again. Only the edit submission link allows for storing uploaded files since the files are stored on our servers.