Desu~kun

Are you still able to add your own or custom schematics to the custom npcs builder block? Every time I add new schematics to the schematics folder in custom npcs 1.12.2 it never shows up in the schematics list. I have changed the names of the schematics to match the names of the pre-installed ones and made sure it was sorted by alphabet but it still will not load them into the list for me to select them. Does anyone know if this is and error or is this feature no longer supported? And if it is an error, how might i go about fixing it?