On the Oppo smartphone, contacts can only be imported directly from another smartphone (via Bluetooth) or from a vCard file on the memory. In addition, there are no other options such as selecting individual contacts in the file, so only the entire file can be imported.

Android 10 (ColorOS 7.0)
Step 1:  Open the  Contacts -App
Step 2:  Open the  Menu
Step 3:  Tap on  Settings
Step 4:  Tap on  Import/export contacts
Step 5:  Choose between  Import from storage  and  Import from another phone
Step 6:  Select an destination  Account
Step 7:  Choose desired  File
Step 8:  Choose between  Cancel  and  Merge
  1. Open the Contacts-App
  2. Open the Menu
  3. Tap on Settings
  4. Tap on Import/export contacts
  5. Choose between Import from storage and Import from another phone
  6. Select an destination Account
  7. Choose desired File
  8. Choose between Cancel and Merge

Oppo Instructions
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