Add items to Books in Apple Configurator 2
You can create the following types of output and add them to the Books app on iPhone and iPad devices:
- EPUBs 
- PDFs 
Note: You can’t use Apple Configurator 2 to add books purchased through Apple School Manager or Apple Business Manager to devices.
- In Apple Configurator 2  , select one or more devices that the EPUBs or PDFs will be copied to, then do one of the following: , select one or more devices that the EPUBs or PDFs will be copied to, then do one of the following:- Click Add  in the toolbar, then select Documents. in the toolbar, then select Documents.
- Choose Actions > Add > Documents. 
- Control-click the selected devices, then select Add > Documents. 
 
- Select the Books app. 
- Choose the documents, then click Add.