Calibre does not update the embedded metadata in the ebook format files - it updates its database. To embed the current metadata in the ebook format files you need to use one of the following tools:
- Send to Device, that will embed the current metadata in the format file that is Sent but leave the library copy as is
- Save to Disk, make sure you check the Preferences->Save to disk->Update metadata in saved copies setting. StD will also leave the library copy as is.
- Embed Metadata (you may need to add it to a menu/toolbar), that will embed the metadata in the library copy of the format files.
- Polish Books (you may need to add it to a menu/toolbar), has several run time options one of which is to update the metadata in the library copy of the format files. It can be used on EPUB and AZW formats
- Modify optional plugin, it has many run time options options, one of which is to update the metadata in the library copy of the format files.
BR