Hi Andy, unfortunately this can only be done via the OPDS browser (and even that wouldn't be very accurate). In, say, Dropbox there isn't a way for me to peek into the file to see what's inside it before downloading it entirely. In fact, the flag that shows up in Dropbox is just based on filename. The OPDS service gives me more details a priori to determine whether a book already exists in the library (note that you might want to download it anyway if, say, you have the same book fixed for typos). I'll add the idea to the wish list and put some more thought into it.
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