After jailbreak, your next synchronous push software.

Find a professional PDF browser in it.

The reason why I introduce synchronous push to you is because all the resources can be searched in this software, and you can choose to download the official version or the cracked version, and the source file is more reliable.

In this way, you can simply put the PDF into the iPad with ituns, select the corresponding software in the application software, and drag the PDF into it.

According to my personal use, iFile is not very useful if you don't need to modify the kernel file of the system or software yourself.