How to synchronize music between PC/Mac and your iPhone.

​1) Drag and Drop your music file into iTunes Playlist to copy.

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​2) Connect your iPhone/iPad to PC/Mac, then select "MUSIC" and click "Entire library" in case you want whole music else you should select each.

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​3) After complete the synchronization, the same Playlist shows up on your iPhone device.

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​4) ​In case you have trouble, please check "OFF" on Setting>Music>Sync Library.