Hi. I need to set up a set of local files, e.g. not online. My online Spotify playlist works perfectly, but if I try to either 1) access iTunes online 2) access downloaded iTunes files in my library 3) access non-iTunes mp3 files stored on my local machine, this is not possible. When I try to add via ‘my files’ the mp3s are grayed out as if they are not a valid file format.