How to move models from revit to unreal?

guys i am an architecture student and i am trying to move revit buildings model (walls_floor_ceilling) only
what am doing is moving (walls_floor_ceilling) to 3ds max using the autodesk workflow flatten uv maps using 0.02 spacing for each map1and2
then i export the building to ue4 the i set uv channel to the second one the shadows are so bad in quality and not correct as seen in images i tried to use scripts like ts_tools and steamroller and none of them worked i keep having the same shadow crap
is there any good way to move from 3ds max to unreal without having my head blowed up or any way to fix this crap
please don’t link youtube videos i’ve watched them all ![revit][archetict]