Transferring Audio Files from a Windows Computer:

1. Establish a connection between your Xperia M2 and computer via USB
2. From the AutoPlay window on your PC, select to browse the phone's files and folders
3. Access the "Internal storage" folder
4. Open a second Windows Explorer window and navigate to where the desired audio files are stored on your computer's hard drive
5. Copy the desired files
6. Go to the "Internal storage" folder on your phone, and paste the audio files in the "Music" or "Notifications" folder
7. Once the transfer is complete, click the "Safely Remove Hardware" button located in the system tray
8. Then, click "Safely Remove Mass Storage Device" > "OK"
9. You can now disconnect your smartphone from the computer

Setting a Custom Notification Sound:

1. After transferring the desired audio files, tap the "Applications" icon from the home screen
2. Tap "Settings"
3. Under "Device", tap "Sound"
4. Tap "Default notification sound" under "System"
5. Select the file that you wish to use as your notification sound. NOTE: newly added files should be found at the bottom of the list
6. Tap "Done"

Changing the Ringtone for All Calls:

1. From any home screen, tap the "Apps" icon
2. Open "Settings"
3. Scroll to "Device" and tap "Sound"
4. Tap "Phone ringtone" under "Ringtone & Vibration"
5. Tap the "Music" icon located in the top-right corner of the screen
6. Select the audio file that you wish to use
7. Tap "Done"

Changing the Ringtone of a Specific Contact:

1. Launch the "Phone" application
2. Access the "Contacts" tab located at the upper-left area of the screen
3. Select the contact that you wish to assign a custom ringtone to
4. Tap the "Edit contact" icon located in the top-right corner of the screen
5. Tap the "Ringtone" drop-down menu
6. Press the "Music" icon from the upper-right area
7. Navigate to the desired audio file, select it and tap "Done"
8. Tap "Done" again to save the changes and exit the "Edit Contact" mode