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In addition to the many standard sounds for notifications, we can also use our own notification sound. For this purpose, the sound setting offers an option "Select from file", which automatically searches the Oppo smartphone's memory for MP3 files and displays them.

Android 11 | ColorOS 11.0
Step 1: Tap on  Settings
Step 2: Tap on  Sound & vibration
Step 3: Tap on  Notification sound
Step 4: Tap on  Select from files
Step 5: Set a  Custom Notification sound
  1. Tap on Settings
  2. Tap on Sound & vibration
  3. Tap on Notification sound
  4. Tap on Select from files
  5. Set a Custom Notification sound
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Oppo Instructions