Transfer Audio Files from a PC:

  1. Connect the Android device to the PC using the USB cord
  2. On the phone, enable “Media device” / “File Transfer” at the prompt or from the Notification area
  3. Open the File Explorer on the PC
  4. Navigate to the audio files on the computer and copy the desired ones
  5. Paste the files to the phone storage in the “Ringtones” and/or “Notifications folders
  6. Once done, eject the phone storage and safely disconnect the device from the USB port

Change the General Ringtone:

  1. Launch “Settings
  2. Access “Sound & Notification
  3. Select the desired ringtone and tap “OK
  4. Optionally, turn “Also vibrate for calls” ON or OFF

Change a Specific Contact’s Ringtone:

NOTE: You can’t set custom ringtones for contacts located on the device’s internal memory or SIM card.

  1. Launch “Contacts
  2. Tap and hold the desired contact
  3. Tap “Edit” > “menu
  4. Go to “Set ringtone” and select the desired ringtone
  5. Tap “OK” to confirm

Change Notification Alert Sounds:

  1. Go to “Settings” > “Sound & Notification
  2. Tap “Default notification ringtone
  3. Select the desired ringtone
  4. Tap “OK

See More: ZTE Axon 9 Pro: Transfer Audio Files from a PC and Set Custom Ringtones and Notifications