This Unreal 5.3 Gameplay Ability System video is about connecting the Enhanced Input and Gameplay Ability Systems. We do this by first adding the Input Action variables to the Third Person Character, then binding those Input Actions to functions that pass along the appropriate Ability Input ID from the Enum created in Project Setup, to the Ability System Component. We then create the Input Action files, add them to the Input Mapping Context, with associated keyboard keys, that the Third Person Character uses. Lastly, a test Gameplay Ability is created and Given to the Third Person Character.
https://dev.epicgames.com/community/learning/tutorials/49VR/unreal-engine-03-enhanced-input-let-s-make-a-top-down-shooter