Audio files can be added to the library using any of the following methods:
Adding audio files from a specific folder
Click on the File > Add folder to library... menu item.
Select a folder to add to the library and click on the OK button.
A dialog box will be shown and the audio files from this folder will be added to the library.
Adding specific audio files
Click on the File > Add files to library... menu item.
Select the audio files to add to the library and click on the OK button.
A dialog box will be shown and the selected audio files will be added to the library.