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Oppo's ColorOS operating system allows us to set our own ringtone for calls and messages in addition to the standard ringtones, and in the case of dual SIM devices, our own ringtone can be set for the SIM card in question.

It doesn't matter in which folder the own ringtone is stored, the function automatically searches the whole memory for supported file formats like MP3.

Android 11 | ColorOS 11.0
Step 1: Tap on  Settings
Step 2: Tap on  Sound & vibration
Step 3: Tap on  Ringtone
Step 4: Choose a  SIM card   (Dual SIM)
Step 5: Tap on  Select from files
Step 6: Set a  Custom ringtone
  1. Tap on Settings
  2. Tap on Sound & vibration
  3. Tap on Ringtone
  4. Choose a SIM card (Dual SIM)
  5. Tap on Select from files
  6. Set a Custom ringtone
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Oppo Instructions