Usual built-in iOS webview cannot display charts, diagrams and SmartArt. In stead it leaves empty spaces.

Here how objects are displayed in Documents Viewer

What’s More?What’s More?

Documents Viewer:

•Opens documents with all elements (themes, styles, shapes, etc.) neglected by system preview;•Converts “realistic” documents to PDF;•Prints them via AirPrint;•Integrated with Dropbox, Box, Google Drive and OneDrive.

Download from AppStore