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I can't figure out how to open PDF files in my note 7. They won't even download. If tried a few different things with default settings but still nothing. I had the same issue with ny note 4 and was able to fix it bit now i can't figure it out on the 7.
To start, you need an app that can read pdf files. Phones don't read files, apps do. You're probably trying to open the file, and the phone can't do that without a pdf app. Try Foxit MobilePDF.
Welcome to Android Central! Do you have Google Drive and Google Docs installed? That ought to give you the ability to view PDFs. Otherwise, you could also try Google PDF Viewer.