PDFs are horrible for so many reasons. When you send books to the device using calibre, it will try to update the metadata. But, for some formats it cannot. For PDFs, this cannot always be done and it is related to how the metadata is stored. Which is pretty much the limit of my knowledge as the only PDFs on my Kobo devices are there just to see how they work.
But, the metadata plugboards can be used for any format. You can create them specific to each format you are interested in. Or you can create one for "any format" which will be used if there is no more specific plugboard.
Of course, if the book on the device matches a book in the library, and the options in the driver are configured correctly, then the metadata will be updated the next time the device is connected.
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