Apex cloth latchtonearest dosen't work

I created a simple scene to test the apex cloth.
what my purpose is to make the blue part move following the red one.
so i painted the latchtonearest value in maya,
in maya everything looks fine.
but when i export it to UE4,the blue part doesn’t work at all.I don’t know what the problem is.
anyone can help me?
here’s the screenshots:

I’m having king of the same problem :confused: