Hello there again Corbis. This really depends on how many instances if these elevator-button pairs your are going to put in your level. I’m sorry I don’t really have in mind what kind of project you are creating so it’s hard for me to say how I would go about it. If it is only one elevator then you can use create the interaction in the level blueprint with an event upon collision event.
In general I would cast it to the elevator upon hit of the elevator button.
In this example I created an event where I spawn an energy ball when my mouse cursor is over an enemy. I did this by casting the hit result to my enemy. I’m imagining you can replace that with your elevator so that instead of spawning an anergy ball in my case, you’ll be moving the elevator (just triggering an event.).