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Storing music on USB stick for iPhone

I got a Leef iBridge for Christmas, which is a USB stick for iPhone. One of the features I hoped it would have is to have the ability to put my Spotify music on it. However I've searched through multiple threads and found nothing asking/answering this question. So, is it possible to store my Spotify music for my iPhone on a USB device, and if it is, how do I do it?
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