Many readers can not work properly with large e-books. The video shows how to solve this problem for books of reflowable-formats (epub/reflowable, fb2, mobi, prc, azw, azw3, doc, docx, txt, html) using Calibre app ([ Ссылка ]).

Problems with e-books of fixed formats (pdf, djvu, epub/fixed) have to be faced much less often because of the specifics of these formats. And if these problems still arise, then they can't be solved using the method described in this video. In these cases, you need to re-publish an e-book using the special software (Adobe InDesign, Adobe Acrobat, DjVu Editor, etc.).

Possible causes of trouble with your ebook reader:
1. A large e-book is published as one chapter, and your device does not have enough RAM to read such a e-book.
When opening or navigation through book, less-quality readers can simply crash out, better ones - display part of the book (as long as there is enough device memory), and at the end of this "part" show a message that the whole book can't be displayed. There are readers that correctly open such books, but there are many other problems and functional limitations in such readers.

When you navigate through a book, most readers will load it into the device's RAM one chapter at a time. For this reason, modern readers may lag slightly when crossing the chapter boundaries. This compromise solution allows you to read large e-books, without the app crashes due to lack of RAM.
This is the most common problem for e-book of reflowable formats and the method outlined in the video allows you to fix such e-books.

2. The e-book has wrong table of contents, internal and/or external links.
In this case, normal readers will still simply ignore the links, and bad readers can crash.
The method set forth in the video can fix the problems with the table of contents, but here in Caliber you need additional customization of chapter title tags.
Problems with internal and external links in a simple way described in the video can not be fixed. Here you need to edit links manually using the editor (for example, built-in Caliber).

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