The Add to Queue function in Android Devices is messy and confusing and apparently people at Spotify don't pay attemption on what paying customers think about this.
Everybody in every part of the world knows that when something enters in queue it must enter at the end of the queue and not as next in the queue. Is simple and intuitive.
If you find an album and select the option Add to Queue will receive a message stating that this content can't be added to the queue when queue is empty.
If you touch on the firts track the albums starts playing, if you try to queue another album the tracks on the new album are included after the track currently playing. You are unable to move the tracks of the first album back to the order you wanted.
Please fix this anoying behavior, it is a not complex implementation.