PDF sizing issue

Hi! I am experiencing the attached issue with PDF files I have created and uploaded. Is this a problem with my sizing? I have tried various sizes, but I am unsure of what size to use. I am not sure how to figure this out.
I have a screen recording of it as well.
(Deleted at user’s request)

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Penbook should recognize the page and size its canvas appropriately regardless of which dimensions you choose - if you double-tap with your finger on the canvas, or zoom out “dramatically”, does it snap to a better zoom state?

I tried both, but neither works.