Users can update their submissions when the option Allow respondents to edit delivered submissions at a later time is enabled on your form.
This feature allows form users to bring changes to their entry and allows form owners to choose which emails to resend.
Tick Resend notifications every time the submission is edited and click on the hyperlinked text Choose notifications.
In the lightbox that appears, choose any of your email templates that you have created for your form. Select any notification templates that you wish to resend each time users are updating their submissions.