I'm just tickled when I find a bit of technology which is easy to use, and solves my problem elegantly.
I'm running my old Firefox OS Nexus 5, and have a pdf I want to view. I threw together a small page with an input type=file, next/prev nav, and Mozilla's pdf.js.
Boom. It lets me pick an order pdf from my downloads, and puts it up on the screen.
This is a family server