Renaming and adding covers implies modifying the ebook file.
So I will repeat -- resend the book.
If that means you must first add it to calibre, and update the metadata, then just go ahead and do that.
If you really want to waste your time, you can do that on the device itself using the ebook-meta command-line utility shipped with calibre, to embed metadata directly into an ebook file.
But that would be really awkward and inefficient!
Or find some other utility which allows editing an ebook file in-place. But if so, you are in the wrong forum, this is the calibre forum...
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