STD_SKIN_HEAD_PBR_HQ_INST material does not compile for SF_METAL.
Took standard CC3+ character from iclone to unreal engine with Live Link transfer. Tried packaging Unreal for IOS. When building the shaders it failed to compile the STD_SKIN_HEAD_PBR_HQ_INST material for SF_METAL. Now all characters just have grey faces.