I created a new opt-in and uploaded the file to the form. How do I allow my subscribers to confirm their subscription and then get the email with the download. I do not want them to get the download when they click confirm. I want to give them a personalized message from me. If I edit the incentive email then there would be no confirmation. If I do an automation and add an email to deliver from that form, after the confirmation happens, when I try to attach a file to an email with a button I only see the option to use a link. I would like a button that says download and have them access the download there. Is this possible?