Here are 3 ways you can add songs to a playlist folder:
1. Open a playlist folder and drag & drop audio files from your computer onto the screen. Once the recordings have uploaded, you can choose how these recordings will be added to your playlist folder (one song made out of all of the recordings or multiple songs made out of each recording.)
2. Open a playlist folder, click the orange + button, and click New song... to create a new song in the playlist folder.
3. Open a playlist folder, click the orange + button, and upload multiple recordings using the bulk uploader by clicking Add recordings... To learn how to use the bulk uploader, click here.