Try this! I have provided some steps below to help you transfer your music. If you only want selected music to transfer to the device you can copy and paste the music or you can drag and drop the music.
Connect the device to a computer using the supplied USB cable.
Select USB connected.
From File Explorer / Finder on the computer, create a new music folder in Removable Disk (X.
Removable Disk (X represents the SD Card installed in the device. This name may vary.
Use the computer to copy music and other audio files into the newly created folder.
For any accompanying artwork in JPEG format, rename the art file albumart.jpg and copy into the same folder as the music files.
To further organize files, create a subfolder in the newly created music folder and copy desiredmusic files into it.