Connect the phone to your computer with a USB Cable. If the default connection mode is not set to Media sync (MTP)/Camera (PTP) mode, open the Notifications panel and tap . Your computer will prompt you with different actions to take. Choose to open the folder to view files.
Use the computer to organize your audio files then create a music folder in your phone’s internal memory.
Use the computer to copy music and other audio files into the folder that you created in your phone's internal memory.
You can use subfolders in your phone’s internal memory to organize your music files or you can simply copy the audio files to the music folder you created in your phone’s internal memory.
Open the Notifications panel and tap. Then disconnect the USB Cable from the phone.