When you purchase one of my eBooks and click through to the download, the PDF file will typically open directly in your device's default web browser. For best reading experience on a mobile device, especially for particularly large files (Eating Well For The Family is nearly 500MB), it is recommended that you send the file from your browser to the Books app on iOS devices, Google Play Books on Android devices, or another e-reader of your choice. 

 

How to Save a PDF to Books on iPhone and iPad

 

How to Upload Your Own E-Books to Google Play Books