The contacts stored on the OnePlus smartphone can only be exported to the device's internal memory as a VCF file, but this does not make it impossible to transfer the file.

After selecting the appropriate Google Account or internal memory, a VCF file can be saved directly.

Note: This function exports all contacts. To export individual contacts, the Share function must be used.

Android 10 | OxygenOS 10.0
Step 1:  Open the  Contacts app
Step 2:  Open the  menu
Step 3:  Open the  Settings
Step 4:  Tap on  Export
Step 5:  Choose an  account  and tap  Export to .vcf file
Step 6:  Choose a  folder  and tap  Save
  1. Open the Contacts app
  2. Open the menu
  3. Open the Settings
  4. Tap on Export
  5. Choose an account and tap Export to .vcf file
  6. Choose a folder and tap Save

OnePlus Instructions