Hi, sorry for the delay… strange days :-/
The first thing to stop it from working is in the SoundCue -
You need to connect a WavePlayer to the ParameterUnset pin as well,
It’s like a default sound to play, for that matter.
Have your first Wave node Output wired up to **both **that first pin and to index 0 pin.
If it’s still not happening, perhaps an input issue ?
I’d check the receiver’s Blueprint > ClassDefaults > Input > Auto Receive Input > Player 0
Another matter is how it’s triggered -
As it is, the key input would work anytime/anywhere in your game world.
If you wish to limit it to certain conditions, say only when the player approaches the receiver, you may use a Gate.
The key input would then pass through and execute only when the gate is open, and you set the terms.
In the receiver’s Blueprint Add a SphereCollision Componenet
Create Events for Begin & End Overlap for that Sphere,
And connect them to a Gate like in my screenshot.
Best of luck !
PS - There’s also a post here from last week with an interesting tutorial, for a more elaborate media playing system.