iOS has no open by default option like Android.
You have to select the app every time you open a book.
At best you can drag the icon for your favorite app to the front of the list in the popup, for instance Marvin was off to the right, and I dragged it to the front of the list.
Sorry, this is one of the strongest reasons why CC iOS needs a built in reader app. Even something simple, would be far better than the current situation.
There are a few EPUB reader SDKs like Readium and SkyEPUB.
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