UV channels?

Development Character & Animation
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Character animation question.

  1. Is it possible to assign different materials to different UV channels?

  2. If so, is it also possible to swap out different materials per UV channel?
    a. For example, in UV channel 1, can I swap between materials A, B, C, D?
    b. In UV channel 2, can I swap between materials E, F, G, H?
    c. In UV channel 3, can I swap between materials I, J, K, L?

  3. Does UE support a Maximum of 3 UV channels…Can it support more?