External HDD desktop to android

[coondoggyjr05]

I recently purchased an android head unit for my vehicle which supports external HDD via USB. I am wondering if I am able to save playlists from my desktop's spotify to this external HDD (because I have a hardwired connection) and then have the spotify app on the android head unit point to this external HDD. Will the file path and the encryption be the same between them both? Or is the only way to do this to have the android spotify app be the one that establishes the directory and download the playlists from that?

Thanks!