First a tip: As of March 2017, hand drawings with the Apple Pencil using the pencil tool in Graphic produce SVGs that play nicely in VideoScribe. This is fun to do, though my wife still prefers her Wacom tablet.
Now the problem/question: Those SVG files also contain an undesired rectangle at the perimeter of the canvas. I've been removing them by deleting the <rect> element with a text editor. But is there a way to avoid them in the first place?