There are two methods: 1. Copy the music file you want to set to the Application Data/sound directory in the phone's memory, and then you will find your music in Settings - Sound Options, 2. Finally Simple method, you don’t need to change anything, just put your favorite ringtone in the root directory of the memory card. Remember, it can only be the root directory, that is, put it directly into \storage card\ Do not add any folders, otherwise it will be invalid. You will also find the music you want in Settings - Sound Options.