Hi guys, I did so many stuff like exporting from 3ds max to UE4… But I recommend .OBJ instead of .FBX… It’s way better than .FBX in UE4 and quite faster to export I think!!.. and If you want to break down Polys, You can try “ProOptimizer” modifier in 3ds Max or You try Mixamo’s Decimator () it’s good too in breaking down the PolyCount… Hope this helps!!
LOVE for UE4!