changing from one background to another

New to Animate, thanks for the help.  I am trying to animate a simple character walking.  Behind him is the background of a hallway.  It moves right to left as the character walks.  Then the character enters the bedroom which is a new background.  It also moves from right to left, then stops.  He interacts with another character and the background dissolves to another scene (background #3).  I'm having trouble getting from one background to the next.  I used new layers for the 2nd background (bedroom) and the 3rd background (new scene).  The classic tween works on the first background but not #s 2 or 3.  Can't find a tutorial that seems to address this.  Again, thanks.