Hi, Myra...I knew to save it as an SVG. But I am starting out with a .png image that I open in Illustrator and then do what is in the video (add the slightly larger rectangle.) And then save as an SVG. And, yes, I used those measurements you mention, and it still didn't work. That was what prompted my above question.
Then I had a thought: Maybe I need the image to be an Illustrator (vector) graphic? So I used the same Gift Box image I had selected previously ( a png file), but the SVG version. Then I did all of the steps discussed, even added text. And it worked! (see the image below)
So make sure people know that this solution only works for an image when that image is an SVG or vector image.