Screenshot taken around 2016. Yes, you could do that, and I don't even remember how.
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That big floor-switch elevator; you can drop off of it the moment before it reaches the next room up. Then you're free to jump all over the place.
IIRC the way it used to work was that you hit the home button then started Miiverse to take a screenshot. But I don't think Pretendo has that implemented.