Doesn't seem to support SSL servers... Downloaded on my Xperia Z5 Compact (current firmware at time of writing - Android 6.0.1) and proceeded to add my server that works fine with the default Subsonic Android app. No dice. Using my premium Subsonic URL or the direct address results in 'resource not found' error messages  even though the 'load in browser' test works as expected.
November 14 2016