The only way I can think of is to create a mockup of the environment in iClone. (I don't know if you could export it from Unreal, that would be another option.)
It doesn't have to be fancy, but it would have to provide the position and size of the stairs, for example, furniture, the size of the room, etc.
After you have created the animation in iClone, it may best to do a Collect Clip in the timeline and save as Motion Plus. The gets you all animation in one clip, which you can then use for exporting.
I'm not an Unreal user, so experts may have a better idea.
Edited
2 Years Ago by
animagic