Let me give you a suggestion. Stop using IBOOKS. There are many problems.

QQ Reading HD and Wei Yun HD can be installed. All kinds of books have compatible formats, which is very convenient without connecting to ITUNES.

The method of importing is simple:

1. When QQ is opened, the computer will find the icon of Wei Yun, open it and upload the PDF file.

2. Open Wei Yun HD in the IPAD, directly open the PDF document you need, find the "Open Method" in the upper right corner, and select "Open in QQ Reading HD".

3. Enter QQ to read, and you will find the PDF document you need lying on the bookshelf once and for all.

4. Other book formats, such as TXT and WORD formats, are also supported.

I hope I can help you. Good luck.