Adding books to my account

Hi, I'll make this as short as possible - looked everywhere I could and did not find an answer and wasn't too sure where to post this question. I currently own most of the D&D 5e rule books and so forth. I wanted to know if there was a way to add them to my account or if the only way to have them added was to purchase them through the Roll20 website. Thanks in advance for the help.

Owning any of the DnD books in any other format doesn't give you access to those on Roll20. A comparison could be, that owning a game on one gaming console doesn't automatically give you the game on all other game consoles, even if it is a possibility. Roll20 does currently have a deal with Pazio regarding PF2E books where buying it on one website gives you a discount on the other.

That is, unfortunately, what I figured.