Transferring Music or Sounds to Your Device:

1. Using the USB cable, connect your Xperia Z1s to your computer
2. When the Windows Explorer pop-up appears on your computer, click "Browse files"
3. Double-click the smartphone's "Internal Storage" folder
4. Open the "Music" or "Notifications" folder
5. Open a new Windows Explorer window, and browse for the desired audio files
6. Copy the files from your computer and paste them in the appropriate folder on your device ("Music" for music, etc.)
7. Once the files have been transferred, click the "Safely Remove Hardware" icon located in the system tray
8. Click "Safely Remove Mass Storage Device" and confirm by clicking "OK"
9. You can now disconnect your smartphone from your PC

Changing the Notification Sound:

1. If needed, follow the guide above to transfer the desired files in the "Notifications" folder
2. From any of the home screens, tap the "Applications" icon
3. Tap "Settings" and select "Sound" under "Device"
4. Under "System", tap "Default notification sound"
5. Browse for the desired audio file and tap the one that you wish to use. NOTE: your newly transferred files will be shown at the bottom of the list
6. Tap "Done" to confirm the changes

Changing the Ringtone for All Calls:

1. Follow the guide above if you need to transfer audio file in the "Music" folder
2. While viewing the home screen, tap "All apps"
3. Tap "Settings"
4. Scroll down to "Device" and select "Sound"
5. Under "Ringtone & Vibration", tap "Phone ringtone"
6. Press the "Music" icon located in the top-right corner of the screen
7. Browse through your audio files, and select the one that you wish to set as a ringtone
8. Tap "Done" to confirm

Changing the Ringtone of One Contact:

1. If needed, follow the guide above to transfer the desired audio file in the "Music" folder
2. While on the home screen, tap the "Phone" icon
3. Go to the "Contacts" tab located in the top-right corner
4. Select the contact that you wish to change the ringtone to
5. Tap the "Edit contact" button located in the top-right corner of the display
6. Tap the "Ringtone" drop-down menu
7. Press the "Music" button located at the upper-right side of the screen
8. Browse for the desired file and select it
9. Tap "Done", and then tap "Done" once more for confirmation