Connect the USB Thumb Drive to the Chromebook via the USB 3.0 port (right edge)
The USB Thumb Drive will appear on the left.
This image is an example only.
Navigate to and select the desired music on the Thumb Drive.
Drag and drop them into the desired folder within Audio.
Not all files can be dragged and dropped into all folders. A small green plus sign will appear over the file image if it can be moved to a specific folder.