Connect a local folder/directory created for this to Calibre as a device. Send the books to it.
Put the storage card in PC (via USB adaptor if no card reader, they are cheap). Use the file manager (explorer) to copy your local folder/directory contents to a folder called books on the card. This WON'T work if the card is encrypted as built-in storage rather than removable portable storage. In that case plug in the tablet with card in it and ONLY have the file manager (Explorer) open (close Calibre, Media players etc) and copy the files.
The issue is Android MTP.
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