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LightMap Problem when importing FBX

Hi

I am new to Unreal

I am using 2016
The Mesh have 2 UV channel
2nd channel was unwrapped by using SteamRoller

Each time I import FBX to Unreal it assign the Lightmap channel to 0
There are so many Meshes and I cant possible change all the meshes to 1 individually

What have I done wrong?

Many thanks