Bücher App funktioniert nicht

Our technology lets you burn through all those books and web articles you’ve been saving to read later by making speed reading easy and effective even if you have no experience.  With Speed reader you can read fast and you can read anything: news, web articles, books, documents, emails, and more!  Use built in browser to search free books or read your daily news sources!  Use OCR to import any paper book, article or document and read it really fast.  To import any book from your existing storage, first add this book to your iCloud drive of Files app on your device.  Tap Import to import your existing books from iBooks and iCloud in a tap!  For example you can read an average web article in about a minute instead of four!  Then open Speed Reader and tap Import.  You will see all your books that you’ve added to iCloud or Files app.  The average adult reading speed is 250 wpm.  Start reading now and see how fast you can read!  With Speed reader you can double or even triple that speed!  You can also search for books and add them directly to your device!  Read 3 times more in the same time!  You’ve found the best reading app out there!  Congratulations!