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I usually cast them from my ipad to the tv.

My ipad may be a very expensive PDF reader but it's bloody good at it.

I understand it not working on a Roku but why couldn’t you use an android pdf reader?

I looked up the android tv box on Amazon. Doesn't support pdfs.

You could always open the pdf on your phone and cast your phone screen.

Yes, and I could hook up my laptop to the TV, too. But I bought the Roku box because it's so much more convenient than dinking around with the laptop.