To add books to a library it is not enough to have it in the folder, you must let calibre know the books are there. Do NOT add it via the File Explorer!
To add books to calibre libraries, there is a button called Add books. Click the arrow next to it and choose the second option in order to add books that were exported from calibre. (This is a special setting to read the metadata files that were saved originally.)
See screenshot.
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