OSX: Add files to playlist

On OSX when using version 2.1.5 or nightly builds of 3.0, when the playlist is populated, I can't find a way to add more files to playlist. On Windows version you can right click on the playlist and select "Add file", "Add folder". I see no such option under OSX. I tried to find a bug describing it or thread in the forum, but I couldn't find it.

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