1. Go to Settings > System > About phone on your phone.

2. Keep tapping Build number until the message "You are already a developer" is displayed.

3. Go to Settings > System > Developer options.

4. Access Developer options, swipe down, and enable Always prompt when connecting to USB.

Notice:

Do not enable Allow ADB debugging in charge only mode. Otherwise, Use USB to can only be set to Charge only.

5. Connect your phone to the computer. In the dialog box, select Transfer files.

6. Access Developer options, and enable USB debugging.

● First time: An authorization prompt message is displayed. Select Always allow from this computer and tap OK.

● Non-first time: An authorization prompt message is displayed. Click OK.