Using webforms, the information about the google adclick gets dropped upon submission of a form. A solution to this was at the end of the submission adding firstname.lastname@example.org , doing this provided information about the google ad(the source of where the user who submitted the form came from). However the issue is the confirmation URL in the form settings can't be modified properly to include the email in the link. I tried doing [webform:url]/confirmation?[webform_submission:values:email] but the result ends up breaking because of the '@' symbol where in the link it is "%40" that replaces the @. Should I be going about this solution in a different manner?