I use a headless Mac Mini as my music source and I both stream from Qobuz and play from local files, which I sync via Dropbox.
Having my files on Dropbox allows me to edit the meta data and add to my library without ever touching my Mac Mini.
One thing I cannot do, though, is create playlists of local music. At least not without unplugging my Mac Mini and temporarily installing it at my desk with a monitor, keyboard, and mouse.
Please consider this is a feature request to be able to add and manage playlists of local files via the remote app.
Thanks. Love the product.