Any reason IPointerDownHandler or IPointerClickHandler

I am new to Oculus development and have been struggling to get basic input to work in Unity. Are the few older tutorials that exist, still relevant? I have noticed that they reference file no longer in the SDK, but have not been dated to reflect the changes.

I am hoping someone here might have some insight into why IPointerDownHandler or IPointerClickHandler would not be working, but IPointerEnterHandler and IPointerExitHandler work fine?

Any insight would be great.