Hello, I am currently on the free plan (I will upgrade when the time is right, but atm I have less than 100 subs so it's not worth it quite yet). I'm currently creating an e-book and I want to have it as an opt-in form to hopefully get more subs, but I'd also like to send it to my current subs. How do I do this? Do I just direct them to a normal opt-in page or will they be added to my list again if they have to input email again? Is there a way to just attach an ebook to a broadcast (on the free plan!). Thanks!