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Unable to load UV channels into Unreal.

Hi! I’m working with 3DS Max 2020, Datasmith and Unreal engine 4.24 Preview.

I’m trying to export some meshes with custom UV’s for lightmaps assigned thanks to UVW unwrap modifiers, but seem to not work.

My workflow is: UVW unwrap for channel 1 > convert to editpoly > add another time UVW mod. and move coordinates to channel 2 > export through Datasmith

If calculated by plugins like steamroller or Autounwrapper all seems to work fine and can I visualize additional channels with flattened uv coordinates.

Anyone can help me? Thanks.