If I place a StaticMesh into the world and change mobility to Movable

If I place a StaticMesh into the world and change mobility to Movable and the existing Matinee will not hold the selection to add a key is it a sequence thing or do I create a new Matinee after I change the StaticMesh to Movable?
Version 4.4.3

Thanks.

You have to create a new Matinee is you change your StaticMesh to Movable.