Controlling master volume – for videos etc

My project mainly centers around a UMG-based video player that I’ve built. One thing that I can’t figure out how to do is control the volume of the video. Of course, users will be able to control their own system volume external to the application, but I would like them to be able to control the volume on the player itself.

It seems like all of the volume stuff in Unreal is based on sounds operating in 3D space, which is irrelevant to this project (I think?!).

The Media Player object itself seems only to have controls/functions around playback of the media as a whole, I can’t see anything relating specifically to volume control.

Anyone have any ideas on this?