
I'm working on a battle UI.
I've already figured out how to make the HUD UI blink and change color when the target is selected.
I even added a marker prefab to the battle member prefab itself, (not the UI of battle member).
However, I can't seem to add the marker(changing the sprite like button sprite) prefab to the battle player HUD.
I want to highlight the UI of the currently targeted character, similar to the image.
(below↓ picture)

How can I make the UI of the targeted character change like this?