In case it is need to either manually load or unload a tape (already present in the library) to a drive, it can be done from the Etere Data Pump > Configuration > Tools module, where the related functions are available:
Etere HSM - Data Pump
After tape is loaded or unloaded manually from tape library, it is mandatory to perform a scanning (Ctrl + F5) of tape library to refresh all tape media in the library.