Before and After...
Go back to a previous daily sketchbook prompt and take a photo of the entire page.
Add to that page to make it more visually interesting and/or complete.
Take an after picture and stitch/combine the two images together so that I can see both at the same time.
Upload this to Canvas.
You can easily combine two images together by inserting them from the camera roll in procreate on the iPads and then exporting that image back to the camera roll to upload to canvas. I would strongly prefer for you to use the iPads for this purpose.