Baidu Post Bar itself has no function of downloading novels. You clicked on the downloaded novel shared by your friend. You can try to find it in the following places.

Open a common browser and view the download directory. If there is a TXT file, congratulations on finding it. If not, please open your latest download. It may not be a TXT file, so you need to decompress it yourself.

Find the download folder in the mobile phone file management, open it and have a look, maybe there is.

See if your mobile phone comes with an APP for me to download. Open it and have a look. There may be one in it.

Open your novel reader, such as palm reading, click the+sign on the screen, and then click Read Local Book. There are two categories: intelligent guide books and mobile phone address books. If you can't boot intelligently, you can search the folders in the phone directory.