Once you've used "Open In" on iOS a few times, it'll offer you your most used app as a default. For example, if I open a PDF file in Safari on my iPad and tap the top of the screen, I get "Open In GoodReader" at the top right of the screen (because that's the app that iOS knows I normally open PDF files in), and "More" in the top left. Tapping "More" shows me the other apps I could open it in, as well as giving me other options (print, etc).
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