2. After entering the file manager, select music files on the file type selection page, so that you can find music files faster.
3. After selecting View Music File Type, click any music file in the displayed music file page.
4. After clicking, the option of opening mode will pop up at the bottom of the page. Select the cool dog music that needs to be set as the default music player.
5. After selecting Cool Dog Music as the playback software, you need to check the next default option at the bottom, and don't prompt this item again, so that Cool Dog Music will be successfully set as the default music player of the mobile phone.