Interract from blueprint without components to level blueprint

Hello, I am trying to make a camera rotate in the level blueprint and it will rotate only when I click on a button on the screen which is created within the HUD blueprint, the same way as in the HUD example.
So, I’ve set up everything, I can press the button and in the level blueprint I’ve set up the camera to rotate but I don’t know how to link the two, I’ve tried event dispatchers but I can’t get the “Button toggled (BP…)” like in the Blueprint communication level inside its level blueprint.
If you could explain how this event is “recovered” inside the level blueprint (The Blueprint_Communication example I based myself on is the 2.1 which catch the event from the button blueprint to the level blueprint, and then turns on the light blueprint)
Thank you

I just solved the problem, in the end I used an interface blueprint instead of events, like explained here : Pass Variable from HUD Blueprint to Level Blueprint - UI - Unreal Engine Forums