If necessary, touch and hold the Status bar (area at the top of the tablet screen with the time, signal strength, etc.) then drag to the bottom.
The image below is merely an example.
Tap the USB icon then tap Media (MTP).
Launch File Explorer or Windows Explorer on the computer.
Using the computer keyboard, press Windows+E (+E) keys.
Alternatively, right-click Start then click Open File Explorer or Windows Explorer.
Using File Explorer or Windows Explorer, navigate on the computer to Libraries > Music.
Use the computer to copy music and other audio files into a folder on the device.
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 desired music files into it.