Put a different way.
In many cases, a portable device can NOT be the middleman in the transfer into calibre. Besides DRM, many have 'protected storage' that is not accessible (in or out) via the USB port.
Also note: some books will not be delivered to your PC in any form (They know about Alf's tools? ) This is NOT just a Kobo thing. I have Kindle books that only show on the Tablets Library and not the one on the PC (I do have that upgrade blocked t 1.17, which may be that reason)
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