This is in regards to NNIAS mod issue.

As an overview, the mod increases the distance that the game already stacks cards.

For general "mods not working" there are a couple of things:

1) If you are running on a ARM based Mac such as an M1 or M2, the game must be run with Rosetta for mods to work.

2) If you had BepinEx installed previously, you need to remove it. This is something you would have done manually.

3) If you are running ThunderStore.io to launch the game, it is no longer compatible. Use Steam Workshop.


Otherwise

An easy way to test if the mod is working is to go to the mod's options and change the stacking distance to a high number such as 10. Then see if a card will stack at a far distance.

You can use the cheat menu to spawn cards if you like. It is K+O+F1 all held at the same time.
That can be used to spawn a card such as a tree. See if the wood or stick that is dropped from the tree stacks to a relevant pile further away.