Where are the books I converted and loaded on device?

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http://www.mobileread.com – Hello. I am using a Samsung Galaxy tab2 with the pre-installed Kindle app. After I convert the book from epub to mobi and send to device, where does it go? It isn't showing up in the Kindle library when I launch the app. However, when I look at the Kindle folder on the tablet (via my pc) it shows the book with "epub". Any help is appreciated, thank you. (HowTos)