Alembic don't synchronize with skeletal mesh

I use maya simulation the cloth ,and export it with alembic file,i set the FPS 25 befor export .

In UE,i import skeletal mesh(with aniamtion) and alembic file(cloth simulation),they are synchronize at the first frame and end frame,but they don’t synchronize at other frame.

PS:In the Console,i set the t.MaxFPS 25,they still don’t synchronize at other frame.

Anyone know how to solve it?
I use UE4.14

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