Datasmith-UV Coordinates for Lightmap UVs in UE4

Hi Everyone,

I recently installed Unreal Engine in my PC and I was trying to export from Revit into Unreal using the beta version of Unreal Studio. I followed the exact same process used at my office, with same version of Revit + same version of 3Ds Max and same version of the Engine.

However for some reason, when I import *.udatasmith, the engine doesn’t generates any additional UV channel that does an auto-unwrap. I was used to get three UV Channel where the number 2 had very little overlap and now there is only one where all UV are messed up (0).

I know that I can create another channel in 3ds Max and unwrap the Uv manually, but I am working on really large projects with plenty of links, including MEP and civil,

Any idea on how to solve this problem?

Thanks