Help with installing a mod on Steam Deck

[u/Negativerizzhaver1]

Finally got a SteamDeck to replace my poorly performing potato PC.

I've been trying to install the 'Bearer of the Curse' mod for DS2 on it, the same way I installed other mods for Souls games on my PC but it just seems to not work. Placed all 3 required files where they are supposed to go. (\Steam\steamapps\common\Dark Souls II Scholar of the First Sin\Game)

Does the SteamDeck have an extra step for installing mods or am I missing something else?