That means you have to create a PDF that is the right size with proper margins for the interior of your book (they offer numerous print sizes; my novels are 6 × 9 inches). (davidderrico.com)
For everyone else, there is seldom an off - the - shelf solution to generate a proper table of contents, use industry standard fonts, employ proper margins or convert it from one format to another. (goodereader.com)
Be sure you know proper formatting — when to indent, how to create proper margins, etc.. (firstmanuscript.com)