If you send the book to the device from calibre, via the GUI (not the library folder), the metadata will be embedded in the file. I don't know if that's true for FB2 as well.
If you copy the file from the library folder, the metadata won't be embedded. In that case, you'll have to embed it before copying. There are several ways of doing that, but again, I don't know if they can be used with FB2.
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