Can I use the unique ID to retrieve forms data?

I saw a unique ID generator widget, which generates unique ID of each form
submitted. Is it possible to somehow use this id to retrieve the forms data
for the customer, when he/she logs in to the website again?
I have been trying to figure out how to make customer log in interact with
the form but haven't seen any widget that does it.
Your help or guidance will be much appreciated
Thanks!

You don't have to use a Unique ID field, you can use the submission ID alone to retrieve the users data through edit URL. Submission ID is also unique, it is generated on every submissions. 

Example:

https://form.jotform.com/edit/357852838113858334

Where 357852838113858334 is the submission ID.

You can get the submission ID in your form submissions page.

You can also add the submission ID in your email notification.

Please take note that through edit URL, users will be able to edit/update their existing data by resubmitting the form.

Hope this helps!

Hi
Is there a way to include the form submission URL in the thank you email or
notification email automatically?
...

Yes, that's possible. If you want to add the edit URL on email notification, just insert the edit link tag {edit_link} anywhere in the email template or you can click it from the form fields.

If you want the form submission URL, you can add this on email.

https://form.jotform.com/submission/{id}