Here is your first problem: when you copy a lot of books to documents folder, Kindle starts indexing them. Until this is done, many things might work slow or not work at all. To track the progress, search for a nonsense word, e.g., “123abc”, and tap where it says “Books not indexed yet (number)” (or something similar, don’t remember the exact wording). To help indexing, put Kindle on charging and just leave it until it is done. It might take minutes/hours/days depending on number of books.
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