There are two methods:

The first is to copy directly with your mobile phone. First open the mobile file management, then find the song you want to copy (usually in the folder of the music player) and copy it directly, then return to the previous level until you go to the home page of the file management, then select the SD card and find Open the folder you want to copy to, and finally paste it.

The second method is to use computer assistance. First, connect the phone to the computer. After connecting, open the file management of the phone (in my computer, removable disk, see which one is the memory of the phone, remember which disk your memory card is, then the other one is the memory of the phone) and find the file you want to copy. song, then copy and finally paste to the memory card.