What is a background scene and how can I insert something in the background?

The 3rd tab in the sidebar is the background scene tab. The background scene contains all objects, time events and interactions that are running in the background – for example background music.
By clicking on the 3rd tab, a scene opens in the scene view that looks a little different from your other scenes. Everything that is added within this scene is available and active throughout your entire VR project.
To insert background music, you have to add an object and upload some music (.mp3 file). Now add a time event to the background scene at second 0 that plays this audio object. If everything was done correctly, the audio plays in the background now while the user jumps from scene to scene. It is not affected by a scene change.