how to set pawn for player controller


I am new to UE yet, and have a quick question.

I am using a custom Position/Orientation Tracker plugin (my_tracker), and want to control the player controller view using it.

For simplicity, I added a very simple scene and a pawn.
I added “camera” and “my_tracker” with “Add Component” for the pawn.
I ran it, but the initial position was decided by “PlayerStart”.

So, I pressed ‘pawn’ in "world outlier’ and chose “player 0” for “auto possess player”.
I ran it again and I got the correct position and orientation, but the view didn’t move at all even though the viewpoint should move depending on the position/orientation of my_tracker.

Would you mind letting me know how to fix this?
Thanks a lot.