Filling Field Values from Query String
It's possible to fill field values from a GET query string. To do this, simply include field names that match the field handle(s) in the form.
Instructions
1
Enable this feature by toggling on the Fill Form Values from the GET Query String? setting inside the Form Behavior Settings.
2
Try it out with a string like this in the URI, e.g. ?firstName=Bob&myRatingField=3.
This should flll in the firstName field with Bob, and select a rating value of 3 stars in the myRatingField field.