Art Object mesh question

[eleteguard]

I was attempting to attach things to character through spells such as tail, horns, and wings that are normal items. The issue is when I set an art object to the horns for example, they appear in game but are static. As in they do not move with the head, just hover where the head should in a dealt pose.

So the question is do you have modify mesh to itself or make changes somewhere in the creation kit to make it function properly as an art object?