Add Stock Audio
To add audio files/music, you can use Scenery's Shutterstock integration or you can simply drag a .mp3 or .wav file that you have into your media library or project.
Select stock media or import
Choose Shutterstock and navigate over to the music icon
From here, search for the genre or keyword you'd like to apply to your video
Dragging audio onto a track
Once your audio is uploaded, select and drag the audio file onto secondary track called, "A2".
From here, you can adjust your audio by selecting the track. Once the line, in the middle of the track appears, hover over the line and drag the line to a volume level you prefer.
The other option is to adjust your audio from the "volume" slider within the properties panel.
For more information, watch the Scenery in 16 seconds to learn how to access Scenery's stock media library: