How to export PDF files without saving to iBooks on iPhone 6s using 3D Touch

In iOS 9, Apple introduced a useful feature which gave users the ability to save web pages, notes, photos and more as a PDF.
The ability to save different things as a PDF has long been a feature in OS X — and it’s an incredibly useful one. Rather than printing important documents or web pages that you know you’ll need access to later, you can simply save them locally.
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