Make sure your canvas name is set to "Draggable" in order to make this work. If you want to change the canvas name, you'll have to change the code also
Make sure the embed code with the Javascript is the first layer of your canvas
This feature, as of now, works best on desktop only
To create the transparent images, I added an image to Canva and used the "remove background" and saved as a transparent .png
To view this video make the canvas visible in preview by going to canvas > and unselect "hidden to start"