Download App Updates
Make sure you update your applications, both first and third-party, before you download Android Pie onto your Galaxy S9 or Galaxy S9+.
Samsung's updated many of its applications with support for Android 9.0 Pie. The company says you'll need to update some apps including Calculator, Samsung Internet, Samsung Health, Samsung Notes, Samsung Members, and Samsung Pay individually.
These updates deliver new features and they'll help the app maintain performance after you download Android Pie.
Apps that haven't been optimized for Android Pie might not work properly after you make the transition.