I ran a Zine Quest KS back in February. I created a dowload key so that backers could access the files from Itch. Theya re all using the same download link/key.

However, they are unable to add the files to their libraries because they do not "own" them.

How do I generate a coupon or other type of key that will give them free access and allow the files to show up in their collections/library as owned by them?