1. Take iPhone system version 13.5. 1 as an example to open a book application.

2. Enter the book application, select Reading, view the books you are reading, and set the reading target.

3. Select the stack.

4. Choose books, such as books in PDF format.

5. Click PDF to open the imported PDF book.

6. Click a specific PDF book to edit it.

7. It can be deleted and shared, or added to a collection and created.