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I had a similar problem. I wanted to open .mobi books from Calibre Companion in Kindle, and the Kindle app didn't come up in the options. I found a free app called "Book Loader for Kindle" on Google Play that seems to do the trick. If I select that from the options I'm given in Calibre Companion it copies the book to my Kindle folder and it shows up in my Kindle list. It should work for books opened in Dropbox too, hopefully.
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