How can I make Forge display specific images for tokens?

[Leshracer]

Hello, everyone.

First off, thanks a lot for this amazing program; it's been great for testing decks I intend to pilot IRL. That said, I have one question: how can I make Forge display specific images for tokens? Pretty much every single token ever made seems to have been downloaded into the "token" folder, but I can't seem to find a logic behind which exact images the program chooses to display during gameplay; also, sometimes tokens just come out with no image whatsoever.