Adding Referrer To Mautic 3.3.2

Mautic: 3.3.2
PHP: 7.3.27

Hi Everyone.

I’m trying to add a Referrer to a Mautic form and have followed everything as closely as possible per this video:

Has anything changed that would not allow this to work in the latest Mautic. And assuming it is user error (about 99% sure of that), can anyone paste the code they use to accomplish this?

I want to be able to identify the source of a submission and having a heck of a time getting it done.

Any help is much appreciated.

I’m also curious if anything has changed?
Will the code work with v3.3.4?