I copy books into the Documents folder all the time. However, if you download the files direct to the Kindle Fire HD, they go into the Downloads folder ONLY and cannot be transferred to any other folder or area without the aid of a PC. Just a dumb way of doing things, but it is what it is.

Gary cool
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!

K+E=W (Knowledge Plus Experience = Wisdom.)