The music is available in the app, but because of copyright rules, the final video is saved without it. Don’t worry, you can still add the track afterward right on Instagram. Just tap the How to Add Music button, and you’ll see easy steps on how to do it.
How to Add Music:
Save your finished video without sound to your gallery.
Tap the Add Music to Instagram button right in the app.
This will take you to the right track on Instagram, where you can tap Use Audio.
From there, choose your saved video from the gallery, and Instagram will automatically add the music.