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Butterfly wings flap materials (Help!)

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KidmanLee polycounter lvl 4
Hi, This is my first post. I am studying particle effect in UE4, and I am trying to do a butterfly particle effect by myself. I bought the "Insect Birds and Fish FX" on the UE4 market place and try to make something similar but the mesh is not acting the same way as I expected.

*Problem:
 The wings should perform up and down at the same time but not incline either left or right.

What I am thinking is because the mesh of two wings are combined as a single mesh and the pivot point is at the center of the single mesh so it just rotates either left or right? I tried to set not to combine meshes in the import mesh setting still not fix.



Here's the nodes:



Anyone knows the reason plz help!
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