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You can download individual tracks, or a Playlist directly to your portable device, automatically or by dragging and dropping them onto the device. For a list of supported portable devices and their plug-ins, click here.
The amount of memory on your device determines the amount of music it can hold. If you choose to synchronize your entire Library, your device may not have the capacity to store that amount of music
Sometimes clicking the Refresh button will be necessary to view the most current music on the device.