If you want to use your Sound Alerts browser source you have to make sure you do it the correct way. Don't forget to implement the Sound Alerts browser source in all of your relevant scenes to make sure your alerts will still work when switching to another scene.
To use your Sound Alerts browser source in other scenes, you can just copy & paste the browser source into a different scene in your scene collection.
Either use Ctrl +C and Ctrl + V or right-click your browser source and press "Copy". Now you can go ahead and switch to a different scene and right-click > Paste your browser source.
Note: Be aware that if you change anything to that browser source, it will automatically change in the other scene as well. So be careful with that!
