I imported you stuff, i put the skel mesh in a BP, the you can do this:
Crucial parts are:
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Element index - the left eye came in at slot 4 for me
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Notice I made the material there eyeball_L ( this needs to be a material instance )
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When you use CreateDynamicMaterialInstance it gives you a pin to store the instance ( DynamicMat )
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Then I set the vector parm ( your material parameter just ended up with the name Param after import, but I guess is will be something more meaningful in your version )
