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 10 (ColorOS 7.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Sound & vibration
Step 3:  Tap on  Default notification sound
Step 4:  Tap on  Select from files
Step 5:  Choose desired  notification sound
  1. Open the Settings
  2. Tap on Sound & vibration
  3. Tap on Default notification sound
  4. Tap on Select from files
  5. Choose desired notification sound

Oppo Instructions
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