LMS is an alternative media server which can play to a WiiM device using its Squeezelite client (or via a plugin for the Mini). It runs on a separate server such as a Raspberry Pi as shown in that link. I control it via my iPad and it sends the tracks at their full resolution to your WiiM. Those tracks can be from your local library or from Qobuz, Tidal and other services. If you’ve heard of Roon, it’s like a free cut down version of that.