Well, according to a response by Yunus on realtimevfx.com, it would appear only 3 UV sets are possible for mobile. Although this does not explain why ES2 appears to only support 2.
Well, according to a response by Yunus on realtimevfx.com, it would appear only 3 UV sets are possible for mobile. Although this does not explain why ES2 appears to only support 2.