I am trying to set up form submission tracking with Google Tag Manager for a page that uses a thank you pop up once the form is submitted, rather than going to a new page. I have found a number of previous forum questions about this, but nothing I can make sense of.
All I need to do is use Google Tag Manager to create an event that fires only when a form is successfully submitted. When I try setting up a trigger with Event Name gtm.formSubmit and Event type is Custom Event and This Trigger Fires on All Custom Events, nothing happens.
Do I need to have a proper tag set up to do this?