Adding Facial Rig to ART Character Rig

Hi!

I’m new to using the Animation and Rigging Tools.

I need to add a facial rig to a character that was rigged using the toolkit. Would I rig the face before or after building the control rig? Also, if after, which of the files would I add the rig to? The “export” file or the “AnimRig” file?

Thanks!