Little late to the game, but after you add your library to Dropbox, you may find you'd like an app to help you browse your library and find the right book. AFAIK, when connecting to Dropbox through Moon+ (and most other Android readers), you have to browse it like a regular computer folder.
If you prefer to browse by title, genre, tag, etc. so you can use apps like:
CalibreBox (my fave), CalibreCloud, CalibreCompanion
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