Comment 2 for bug 1731024

Complete list of e-book formats that your device supports.
Text: ePub, PDF, Adobe DRM ePub and PDF.
Graphic: JPG, GIF, PNG, BMP.

Is there a special directory on the device in which all e-book files should be placed?
It seems to be a top level folder called NOOK

Also does the device detect files placed in sub-directories?
Yes. Within the NOOK folder, books are placed in sub-folders created using author Last Name, First Name