See the following for more information:

Export

The ePub Reader provides the ability to export information you've added to books as bookmarks, notes, highlights or updated book information. The exported data file is placed in an export folder location, so you can use file transfer methods to transfer the exported data elsewhere (like your PC). You can use the data to merge changes from your device back to your primary library, if you manage your book collection in that way. The export file format is both human and machine readable.

You can also export updated versions of ePub book files containing changes you've made to book information. In addition, for non-ePub books, or if you prefer to manage book information in external files, you can export OPF and cover image files as well. OPF files are the central control file for ePub books, and they contain all book information or metadata, as well as other book data.

Some notes about this feature that you should keep in mind are

Invoke the export operation by selecting the "Export" ePub Reader option. In the Export dialog, you select which type of data you want to export. The options are

Export and Android 11

Starting with Android 11, third-party applications like file managers will not be able to access files exported to the default export directory location for eLibrary Manager. You will only have access to those exported files using the Android system Files application or by connecting your device to a PC over USB.

However, as of eLibrary Manager version 4.2.1, you can set the export directory to a truly shared storage location (like Documents/export, as an example). You will also need to add an appropriate Root Folder to eLibrary Manager to grant it read and write permissions to that location. See Synchronize and Export for more details.

Launch Export Book
1. Launch Export Book
Export Book
2. Export Book