You must create a job to export media so that the Backup Exec database is updated.
The Backup Exec export media job fully supports robotic libraries with portals. When this job is run on one or more robotic library slots, the exported media is placed in the portals. If you select more media than there are portals, the robotic library will fill as many slots as possible, and then you are prompted to remove the media from the portal. This process continues until all of the selected media has been removed from the robotic library. You can also export expired media from a robotic library.
See Exporting expired media from a robotic library.
You can also select a media vault that you want the exported media moved to after the export job has successfully completed.
You can monitor this job on the Job Monitor.
To export media from a robotic library
On the Results pane, select the slots you want to export media from.
If you want to move the media to a media vault after the export job is complete, on the Properties pane, under Settings, click Options, and select a media vault.
If you want Backup Exec to notify someone when the job completes, on the Properties pane, under Settings, click Notification.