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I built my own door for Bespin. It won't animate in-game. It's using the Tantive IV door animations (as I only need a simple 'up/down' animation). The sound works but the door doesn't open. Any ideas?

Here's the hierarchy and the door:
EDIT: Solved by importing the animation .msh file and enveloping the door to bone_door instead of nesting the door model to the bone_door without an envelope.