60MB is a huge file for the user to download and put on their phones. I would suggest hosting them on a site and let the user download it if they want. Either put a link to it or host it.
What we did was made a hosted site that I put a webpage up and uses PDF.js (https://mozilla.github.io/pdf.js/)
You can then host your PDF there and let PDF.js render the PDF and there is a bunch of built in tools and a download button if the user wants to do that.
PDF.js is great because you can have one webpage and append the PDF Url to the end with a Query string, and the PDF renders in the browser.
You can see an example here of what we did. The PDF has to be local on the same domain, otherwise you may run into some CORS issues, but it works great for us.