Sure @liuzhou, I didn't want to clutter the air space. Here's what I wrote to @Porthos:
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First, could you provide the entire filename of one file you are attempting to download? (File type matters) For an example: ABCDTESTONE.AZW . Further note, if the filename has any funny characters, rename the file so that it has plain characters without spaces. Don't rename the filetype.
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What you have to discover is where the Kindle app is storing files. In Kindle for PC, that directory is listed off the Options menu. In our test, that directory is c:\Users\UserName\Documents\MyKindleContent\ .
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Also find where Android downloaded your ebook file. Go to MyFiles app and start with the top level Download folder, but you may need to go a few folders in to find it. Look through anything that seems relevant. Other things to note: If you use Dropbox, the downloads go to a different folder (than browser downloads). If you are using USB you have to give permission for the tablet to access the device.
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When you find out what your file is named, go to the directory named in #2 and create a new sub-directory with the first part of the filename (i.e. without the .AZW). In this test case, the new directory structure would be:c:\Users\UserName\Documents\MyKindleContent\ABCDTESTONE
Please note that these instructions may not work precisely for everyone, as computer setups can be quite unique. However, if it's not working for you, let us know.
Edited to add: Loading ebooks in this way is called "Sideloading" - which can be googled with impunity. 🤣