These steps outline how to reset app preferences and enable you to update your apps.

1. Go to ‘Settings’ then ‘System’

2. Choose ‘Reset Options’

3. Choose ‘Reset App Preferences’

4. Once you have done this, go back to the audio settings and you should be able to choose ‘General’ and ‘Edit’. Now when you click on the selected Ringtone you should then be shown the below image.

5. Choose ‘Media Storage’ and ‘Just Once’, then you will be shown the list of available Ring Tones to choose