Running on 20w18a (with the API) with no other mods installed, I cant get the drawer controller to work.

Following the screenshots on the mod page, I get this setup:

With this, right clicking on the drawer controller does nothing.

The drawer controller is supposed to let you input items into the controller itself through a hopper, which then fills the items into the 3x3 area of drawers. ;)

Is this information documented anywhere? The wiki just links to the git hub code page

You can find a setup guide on the 'How to use' section on the main page of the mod.