1. First, connect the mobile phone and computer with USB cable.
2. Then select "Allow" on the phone.
3. Then a window will pop up in the computer, and you can choose to open the option of "opening the file viewed by the device".
4. Then click to open the "Internal Storage" disk in the pop-up window.
5. Then right-click the PDF file you want to import and select Copy.
6. Then right-click the internal storage disk and select Paste.
7. Then you can import the PDF file into your mobile phone.