The CC cloud local connection requires a calibre library, specifically:
- A metadata.db file
- A metadata_db_prefs_backup.json file
- Folders containing the books you want to transfer, named *exactly* as they are in the calibre library with the same content (book formats, cover.jpg, etc)
You can't use "send to device" or "save to disk" to create this structure. You must copy (parts of) the calibre library.