If the Oppo device has a memory card slot, we can move data from the internal memory to it and transfer pictures, videos, audio files, documents and App-APK's to the memory card.

Android 10 | ColorOS 7.0
Step 1:  Open the  Settings
Step 2:  Tap on  Additional settings
Step 3:  Tap on  Storage
Step 4:  Tap on  SD card
Step 5:  Tap on  Transfer to SD Card
Step 6:  Tap on  Start Transfering
Step 7:  Choose desired  Data
Step 8:  Tap on  Start Transferring
Step 9:  Confirm with  Done
  1. Open the Settings
  2. Tap on Additional settings
  3. Tap on Storage
  4. Tap on SD card
  5. Tap on Transfer to SD Card
  6. Tap on Start Transfering
  7. Choose desired Data
  8. Tap on Start Transferring
  9. Confirm with Done

Oppo Instructions