When using the "Trending Sounds for Reels" category you will have to add the music to your templates directly on Instagram when sharing.
​
When you finish adding your media to the template and click "Done" you can then press "Add music on Instagram".
​
This will redirect you to the Instagram page for that sounds, where you can press "Use Audio".
You are then redirected to the Reel posting page where you can select the project you created in Mojo from your camera roll (it is automatically saved) and by adding it your project is complete and ready to share.
​
​
​
​

​
​