I think I can help you…
First of all…
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why maya? Create a level sequence, add the bp_metahuman and use default face control rig…
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Ok maya… are you using same morph names? or arkit names on face anim blueprint?
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It’s more much easy to create real capture using any iPhone, I’m remaking the captures because of this… you can record using UE4
Live Link Face on the App Store
the result in minutes: