When I sync my iphone it won't update my playlists?

When I had first synced my iPhone all the playlists where added. However now it won't add new ones or updates to the playlist and changes I have made them

Added (1). I have been syncing it and that isn't working. Sync all isn't working

When you insert your phone, go directly to itunes and click the music tab, once you're there select the playlists you want, if you want all of your songs, playlists and all then just click to sync all.

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