UE can't import leaves animation alembic from speedtree. Rest of the generators successfully imported

Development Character & Animation
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1

I’m trying to import leaves to unreal engine (importing all alembics separately). Whenever I try this, UE hangs. All other softwares- Maya, houdini and blender are able to import it. I don’t understand where’s the issue and I’m losing my mind. My project is stuck.

2

Check the alemic import.
Are the meshes made up of Quads or Tris?

4

tried both, quads and tris.