export cam from maya in Y-up. import into unreal, make an empty actor and place it at the origin. rotated it 90,-90,0.
then attach the cam under the empty actor. Works for me in 4.10. Once setup, you can reimport cam fbx to update the animation without any extra effort.
havn’t tested the other way around though.
some cam came in as original keyframe, but some seems to be baked out, don’t know why.