Whether online or offline, you can view the image app once installed.
Every page has its small thumbnail or not (It is optional that means if the publisher didn't check it, you won't seethem)
listed bottom horizontally above the buttons "Previous" and "Next" (leftward or rightward arrows).
If embed audio file for a page, when enter into it, you can listen companying with read.
Slight click the Previous and Next buttons to turn pages.
Full Screen: slight click the center of screen to switch full screen reading mode.
Press any corner of page and slide for turning page.
If Admob ads embedded, you could glance at rolling ads on the top of the page.