Transfer Audio Files from a PC:

  1. Connect the Android phone to the PC via USB
  2. On the device, enable “File Transfer” / “Media device” at the prompt or from the Notification area
  3. Launch the File Explorer on the computer
  4. Navigate to the desired audio files on the PC
  5. Copy and transfer the desired audio files to the phone storage, preferably in the “Ringtone” directory
  6. Once done, eject the phone storage and safely disconnect the device from the USB cord

Change the General Ringtone:

  1. Open “Settings
  2. Go to “Device
  3. Tap “Sound & Notification
  4. Select the desired ringtone
  5. Tap “OK
  6. Optionally, enable or disable “Also vibrate for calls

Change a Specific Contact’s Ringtone:

NOTE: Custom ringtones cannot be assigned for contacts stored on the device’s internal memory or SIM card.

  1. Open “Contacts
  2. Tap and hold the contacts whose ringtone you want to change
  3. Tap “Edit” > “Menu” > “Set ringtone
  4. Select the desired ringtone and tap “OK

Change Notification Alerts:

  1. Launch “Settings
  2. Go to “Sound & Notification
  3. Access “Default notification ringtone
  4. Select the notification alert you want to set and tap “OK

See More: Sony Xperia XZ2: Transfer Audio Files and Set Custom Ringtones & Notification Alerts