1. On the main interface of the bookshelf, click a line of vertical dots in the upper right corner, and then select Import Books from the pop-up menu.

2. Click the down arrow on the right in the pop-up dialog box and select the import directory.

3. After selecting the import directory, select the book type to import.

4. After clicking the OK button, the application will start scanning the books in the specified directory and give a list of imported books after importing.