How to set oppoA37 ringtone?

1, Settings-Sound-Call Ring (information ring, other notifications)-Select from files (or click online ring);

2, file management-music-long press song-more (or three icons in the lower right corner)-set to ringtone;

3. Any song music playing interface-the left menu key (or the three-point icon in the lower right corner)-is set as ringtone.

4. List of all songs-click the symbol after any song-and select the ringtone (or ringtone icon).