Not sure if this applies to whatever you're trying to do but, mods usually go inside SD:\luma\titles folder.Wow! Could you please show me how (which folder)? I tried but no luck.
In Citra, it's Load\textures\GameID
but in Luma3ds, I can't use the same link, though mods folder in GameId\romfs works fine.
Also make sure you have "game patching" enabled in Luma3ds Menu.