Previously, background images could only be placed behind the canvas.
It is now possible to place it in front of the canvas.
If you are adding it from the room entry page, select "Place in front of canvas" in "Paste method" under "Add your own background image or line drawing."
The background image will be placed in front of the canvas so that it is not obscured by the canvas image.
This is useful when you want to fix line art or borders, or when you want to create a simple filter that uses frames or transparency.
If you are creating from within a room, select "Create Line Art" when creating.