That notice mostly apples to the WORKING (the one that drives the GUI) Library and 2-way sync back to a working library.
Simple reason: Only Calibre MUST make changes to any path (file and folder) name or the DB loses track of the book.
Google drive messes with the file names (adds versioning) which destroys the above DB linkages.
There are device Viewers that can use a cloud COPY of the Calibre Library.
THIS COPY SHOULD NEVER - EVER BE MERGED BACK TO THE ORIGINAL FOLDER.
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