Transfer Audio Files from a PC:

  1. Connect the Android phone to the computer via USB
  2. Enable “Media device” / “File Transfer” at the prompt or from the Notification area
  3. Open the File Explorer on the computer
  4. Navigate to the audio files on the computer
  5. Copy and transfer the files to the phone storage, preferably in the “Media” or “Ringtones” directory
  6. After the process is done, safely disconnect the phone from the USB port

Change the General Ringtone:

  1. Launch “Settings
  2. Access “Personalize
  3. Tap “Ringtone” and select the desired ringtone
  4. Tap “Apply

Change a Specific Contact’s Ringtone:

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

  1. Open “Phone
  2. Tap the contact whose ringtone you want to change, then tap “Ringtone
  3. Select the desired ringtone
  4. Tap “Apply” to confirm

Change the Notification Alert Sound:

  1. Launch “Settings
  2. Scroll to and access “Sound & notifications
  3. Tap “Notification sound
  4. Select the desired notification alert
  5. Tap “Apply

See More: HTC U12+: Transfer Audio Files from a PC and Set Custom Ringtones & Notifications