Originally Posted by nynaevelan
There must be something within the file or the metadata that Amazon recognizes. I re-imported the books without changing anything in them, sent them to my Fire and they were recognized for the Whispersync. Now I am going to try to figure out what Amazon is looking for so I can update the metadata.
It might have to be sideloaded. If you email the book it becomes a personal doc. I will look into it once I get my KF in November if no one else figures it out.