Further into the game you can recruitI waited 30 hours to ask this. Hoped I would figure it out, but I haven't haha.
What's the deal with the cards? I seem to collect them all the time but have no way to view them? Is there a Digimon I should have recruited early on that allows me to restore them or something? Is it someone I recruit late game?
Myotismon
It will open a card viewer at the entertainment district to see all the cards you have collected.