I'm not exactly sure what you mean by previewing tracks directly in "library," but I do know that, for several reasons, it is sometimes necessary to be able to preview tracks while creating playlists. What a huge timesaver if this could be implemented.
07 Aug Moderator
As of recently it is possible to preview tracks in Media -> Tracks by hovering over their album art and clicking on it. If your browser supports the format of the media that you uploaded you should be able to hear the track.
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