[Harry777]

Here's the video I said I'd add. https://imgur.com/a/nZVxLbZ

The first page you see is the penultimate of the pdf, and the next one is the final one. When you see the page move the second time, that was the result of me pressing the left pedal to go back a page after repeatedly press right pedal to go forward (unsuccessfully). I added slow-mo so that you could see how it very briefly scrolls to the bottom before it scrolls up a page. I hope this helps it make a bit more sense.