Can't see unique ID field in calculations

I'm trying to create a unique URL and a dynamic QR code for each submission. I figured that I could set up a Unique ID field, create the URL in a text field using a condition to add the UniqueID to the base URL, and then point the Dynamic QR Code widget to the URL. But when I try to select the UniqueID field via Add Field, it's not one of the choices available. It IS available as a field to check for the condition though. So what is needed to access the UniqueID field?

I was able to confirm that the Unique ID field is not available in the Calculation widget list of fields as well. I think it was by design.

From what I have tested, you can easily use the Unique ID field in generating dynamic URL by applying it after Submission process. Because the Unique ID field value only gets created after the form submission.

You can add the unique id field by attaching it to the URL you want to create... example.

http://www.testurl.com/{uniqueid}/1234567/test.html where {uniqueid} was the Unique ID field.

Hope this help. Let us know if you need further assistance.