When you download an ebook, you have a choice whether to OPEN or SAVE the
ebook. Just like a regular book, when you OPEN the ebook, ADE puts it in
Reading mode, and not into the Library. If you SAVE the ebook, ADE will
put it - unopened - into the Library.
You can add the 'open' ebook to the ADE library using the ADE utility 'Add
Item To Library'. Check out the HELP function in ADE (F1 key).