30 Sep 2018
Firstly, try re-running the migration. Migration only copies files from KyBook 2 that do not exist in KyBook 3, so this will your quickest option
KyBook 3 may not handle badly-formed or corrupt PDFs, causing migration to fail. If you can identify the PDF causing the failure, you could try moving it to cloud storage before retrying migration.
If all else fails, use cloud storage to transfer books:
Cataloguertap the Command icon (top-right of the screen)
Add bookson the menu