Open ireader, click on the blank book column with a plus sign in the blank column, and a window will pop up. Click "Read Local Books" and click this item to jump to the "Import Books" page. On this page, we can see that there are two import methods, namely "smart import" and "mobile phone address book". In fact, the difference between the two is that smart import will directly display local books, while the mobile phone directory will display all SD cards.
Another import method is to return to the home page of the application, and you can see a triangle icon in the lower left corner. Click this icon and select "Import Book" in the pop-up drop-down window. The next steps are the same as the previous methods, and you can choose one of them yourself.