Metahuman wrinkle maps with new skeleton

Hi, I have a wrinkle map setup based on the one that comes with metahuman. It works when the head uses the original ‘face_archetype_skeleton’, but if I import my head with a different skeleton (same bones), the wrinkle map curves don’t get affected at all.

How are the WM curves being driven? is there some sort of reference to face_archetype_skeleton in the .dna that somehow needs changing? is it something in the face_animbp, post process or face control rig?

aha found it, there is a material toggle for the wm anim curves inside the skeleton asset.

Could you tell me how to turn this on?

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Is it in material blueprint or animation blueprint?