Important Feature, for example, if Im making a summary of a book organized in separate pdf files per chapter but the chapter 2 of 4 is corrupted, as there is no manual reorder in the application I should stop until I manage to obtain the chapter in a valid state, so wasted time, I cannot continue because my notes will be Ch 1, Ch 3, Ch 4, Ch 2...Imagine that for a task of 30 chapters.