I'd make a folder and call it Books or something similar and drag n drop the books there although you don't have to I just like to keep things organized (you might even want author sub folders inside the books folder).
Then open the Kobo app on the Arc, from the library page tap the menu/settings cicon, and select import content. (I think I got it right, I'm going from memory of what I saw when browsing the user manual)
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