4.18 Control volume of Media Sound component?

I foudn the Child AUdio Component. I was able to get the context sensitive adjust volume and set volume multiplier from it. I confirmed it was a child of media sound component by getting its display name. However, the volume does not change no matter what I try. This is so frustrating.

As 4.27, still the same issue. On Editor it works, but not on Android, nor iOS.

After Event Begin Play, I dragged a Media Sound component into the blue print, and dragged off Set Volume Multiplier Node, and dragged off Volume Multiplier plug to create a variable. This worked for me.

I was first trying to do the same thing in the Construction Script and nothing happened.

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