I have a few problems when using volume using the web interface (smartphone):
When power is turned off, Volumio does not remember last song, and after power-on always starts with the first song added to the playlist.
When playing a cue-file the problem is that: after playing the first song from the cue-file is the title of the next song does not appear on the page “playback”.
After playing all the songs from cue-file doesn’t start playing the first song of the following cue-file added to the playlist.