A from submission event fires whenever the user tries to submit a form on the webpage.

Parameters

form_identifier: a unique string that is generated to individually identify each form accross pages.
form_step_number: a numeric index that shows which form step is the submission button. ( ex. 10 means that the submit button is the 10th field within the form ) Please note that a set of radio buttons or a dropdown with multiple options that can be selected count as 1 field.
form_submission_count: the attempt count at submitting the form. ( ex 2 means that a user has already tried submitting the form unsuccessfully )

Utilization

You can use this event to create user groups based on form submissions who show increased interest. You may also use it to uncover issues with submitting the form by inspecting form submissions where form_submission_count tends to be high.