title: Allow download of PDFs or Images from iOS or Android app
body: <p>In my iOS app, I have PDFs shown in a webview that are hosted online. How can I allow users to download/save these PDFs to their devices from within the app?</p>
  
  <p>I also want android users to be able to download the content, but the content is hosted as an image, because android's PDF viewing capabilities were not good. So what do I need to do to allow users to download an image from within the app (also in a webview)? </p>