Here is the difference between 'Add to queue' and 'Add to Quick List'

Once files or albums have been 'add to queue', go to the main menu, enter 'Now Playing' - it should start playing the first songs you added to the queue. Now press < , you will find a list of all the songs that has been added to the queue. The queue will disappear once you select a new song not directly from the queue, or after a full power off.

In addition, if you plays a song in any sub-menu (Artists / Songs / etc) under 'Music', every songs on the same sub-menu will be added to the queue automatically. For example: If you plays a song in 'Music > Albums > AAA-album > AAA.mp3', every song next to AAA.mp3 (another way of saying this: all the songs under album AAA-album) will be added to the queue. If you plays a song in 'Music > Songs > AAA.mp3', all the songs under 'Songs' on your player will be added to the queue.

'Add to Quick List' will add songs to the 'Quick list' under the 'Music > Playlists'

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In my experience, it works like this:

If you're listening to an album, or to a playlist, the "Queue" consists of all the songs on that album or playlist. You get information about where you are in the queue on the bottom right of the display, where it will say e.g. 4/12, indicating you're on the 4th song out of 12 in the queue.

Now, if you add a song or album to the Queue, it is tacked on at the end of what's already there. So the next track to play (assuming you're playing in Normal mode, not Shuffle) is going to be what was *already* going to play next, before you added new material to the Queue. (This is what you experienced.) You'll notice that the Queue information will now indicate that there are more tracks: it will say 4/13, for example, if we had just added one song to the Queue discussed above. Once we have finished playing track 12, the next track to play will be the one I added to the Queue.

From the Now Playing screen, if you click left once, you access your Queue. You probably thought of that as just the tracks from the album or playlist you were playing, but it's actually your entire Queue.

Hope this helps.