To import books to Kindle 10th generation, you can follow the steps below: Save the book file (usually in .mobi or .azw format) on your computer. Connect Kindle 10th generation to your computer using a USB data cable. Open the folder where Kindle is located, find and open the "documents" folder. Copy or drag the book file from your computer to the "documents" folder. Safely eject the Kindle device and the book file will be automatically synced to the Kindle. Please note that if the Kindle 10th generation has airplane mode enabled, you need to turn off airplane mode before syncing the file. In addition, different versions of Kindle devices may have slight operational differences. If you have any questions, you can refer to the product manual or contact Amazon customer service.