These days I have been caught up in troubleshooting an error that has plagued my days due to a bug in exporting and importing .abc files
I had in my scene an animated group, to which other meshes with other animations were related (all of them without bones).
Exporting the abc as I had created it (in Maya first), importing it into Unreal would import all the animations exception for one mesh.
Then I thought of deleting the group and related to one animated (parent) mesh all the other animated meshes, exporting from Maya and re-importing into Unreal this solved the problem of the animations, everything animated perfectly even in Unreal, but the materials (always imported with the flatten track disabled) were broken, one mesh was always white, whatever material I assigned, it didn’t make the mesh change color.
I solved it this way:
I removed any group and reanimated in Maya, selected all the meshes, did a bake animation of everything, imported the fbx into blender and exported the abc from blender.
You ask but why specifically from blender?
Well yes the abc export from Maya is broken 