I found something: Add Mapped Skeletal Mesh forces my SkeletalMesh to use the AnimClass “RigAnimInstance” so I can’t use the Animation that’s in the Sequencer.
What I really want from doing this is I want my character Look at the objects in the scene. So I used Blueprint Actor to do this. I will control the “Control” in the ControlRig to position it at the object I want to look at.
I want all of this to happen in the Sequencer without having to press Run Mode.
After spending several hours searching for a solution, I finally gave up on using the Actor Blueprint to change the “Control” position in the Control Rig.
I found a simpler solution, using Constraints in Animation Tools and setting the parent of “Control” to the object I want the character to look at. And I’m pleased with the results.
Perhaps no one else has encountered such a simple problem as I have. But hope it will be useful to someone.