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I have encountered the same issue (and have not migrated from Google Drive due to library size issues). When I view the Calibre Library within the Google Drive browser, metadata.db and metadata_db_pref_backup.json are both present, and when I run Calibre Companion on my new phone, it does not recognize that directory as the library. If there is any additional information I can provide that would help, please let me know.
If it's worth remarking upon, my metadata.db is 4MB.
Thank you for a fantastic program otherwise.
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