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The notification tone can not only be changed in general, but also individually for each app by adjusting the ringtone settings via the app management.

Android 11 | ColorOS 11.0
Step 1: Tap on  Settings
Step 2: Tap on  App management
Step 3: Tap on  App list
Step 4: Choose an  App
Step 5: Tap on  Manage notifications
Step 6: Choose a  Category
Step 7: Tap on  Ringtone
Step 8: Choose a  Ringtone/Sound
  1. Tap on Settings
  2. Tap on App management
  3. Tap on App list
  4. Choose an App
  5. Tap on Manage notifications
  6. Choose a Category
  7. Tap on Ringtone
  8. Choose a Ringtone/Sound
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Oppo Instructions