HELP(Urgent) Horizontal moving,collapsing platform??

I’m new to unreal, and I’m currently making a Paper2D sidescroller game.

I wanted to have a platform that goes to the right and to the left on a loop and, the player would have to time movement in order to get on the platform. Made an elevator but, I haven’t been able to figure out how to make it come up and down on its own. I know about using the Matinee but, how would I set it to come , go,repeat?

And also, destructible floor sprite? That collapses when player stand in the spot too long, and resets to its original position once the player leaves the area?