Joke Collection Website - Blessing messages - How do Apple phones make SMS ringtones and find their own SMS ringtones?

How do Apple phones make SMS ringtones and find their own SMS ringtones?

The bell should not last more than 40 seconds. Right-click a song in itunes-Show the introduction-Options-Set the parts you want at the start time and end time (less than 40 seconds)-OK-Create an ACC version-Change the format of the created song to m4r- Change the previous song back (otherwise, only the parts you selected will be played in the future)-Drag the new m4r file into itunes and it will appear directly in the ringtone options-

Then you can find it in the place where the ringtone is set on the iphone.