Upload an offline-prepared VAT payload and reconstruct the result consumed by attachVat.
This performs no animation evaluation; callers are responsible for persisting and invalidating their
prepared bytes when source animation data or their bake recipe changes.
Upload an offline-prepared VAT payload and reconstruct the result consumed by attachVat. This performs no animation evaluation; callers are responsible for persisting and invalidating their prepared bytes when source animation data or their bake recipe changes.