I’m seeing a phantom UV channel being created. In Max only one channel is used which is 1. When imported to UE with FBX and auto create light map UV’s on I get channel 0, my unwrap and channel 1 which is the auto unwrap as would be expected. When I use Datasmith to import the same asset I get channel 0, my unwrap, channel 1, which is all just packed on top of it self and channel 2 which has split the UV’s into hundreds of small pieces and some large ones and packed them mostly to the top of the UV space.
Why am I getting a channel 1 and 2 with Datasmith and why is 1 unwrapped the way that it is and why is 2 completely different than what it is in the FBX?