ADE will only automatically add books to itself that you have downloaded via the ACSM route (ie ADE opening the ACSM file and downloading the ePub).
What you can do is a Library -> Add item to library (or Ctrl+O) and add the book.
Remember though that ADE will NOT copy the book to it's standard location, it will leave it where ever you had downloaded the DRM free ePub to.
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