I use an iPad and Apple Files as a tool to read FineWoodworking articles – mostly to bring articles with me to my non-WiFi workshop. I find that I can open one pdf, and that works well. However, if I try to back up to the search I had used, go to the Files file structure, or anything else within the FimeWoodworking environment, I cannot accomplish those activities without fully closing FineWoodworking and starting over at the home screen. Can other readers describe how they use iPads to read content, and to move among the article pdfs without the problems I have? 
Thanks!