How to setup a Mecanim character to play face animation?

Hey everyone. I have a character that has 10 different facial animations included within the FBX. When I bring that to Unity as a Generic Rig, the face animation plays correctly. As soon as I change it to Mecanim, only the jaw moves.

I tried creating an animator controller, with the base layer being an idle animation. Then I added another layer below that one and added my looping face animation with Additive and Weight:1. Still I only get the jaw moving.

What am I missing? Thanks!

Anyone have any ideas? Thanks.

On your animations make sure in the Mask Option to Add all the new bones that are not included on the Humanoid:
8503685--1132526--upload_2022-10-10_15-15-24.png

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Thanks for this.