* Opening new .PDF documents with the app will store the document information.
* Night mode: Inverts colors, useful for mangas or books with blank pages.
* Portrait/Landscape: Changes the document's viewing order.
* Categories: The general category is "Miscellaneous" (the name may vary). Changing it activates the sub-level in case you need to add the document to a sub-category.
* Backup the document: Create a folder called Bookkeep within the Documents folder on your device's internal memory. Inside, you'll find the backed-up documents, which are stored in folders corresponding to their categories.
* STORE LAST PAGE VIEWED!: You think it's not important until no PDF or CBR/CBZ reader does it right…
* Long press a book in the list to delete it.