
This action is the inverse of the :ref:`Save to disk ` action, i.e.

All e-book files in a folder are assumed to be the same book in different formats. calibre assumes that each folder contains a single book. You can choose whether to have calibre add all files present in a single folder to a single book record or multiple book records. The folder and all its sub-folders are scanned recursively, and any e-books found are added to the library. Add books from folders and sub-folders: Allows you to choose a folder.If you have selected the e-book reader device, the books will be uploaded to the device, and so on. If you have selected the :guilabel:`Library`, books will be added to the library.

it depends on which :ref:`catalog ` you have selected. Add books from a single folder: Opens a file chooser dialog and allows you to specify which books in a folder should be added.

The :guilabel:`Add books` action has seven variations accessed by doing a right-click on the button.
