The Media tab of the Device Details view shows documents that are managed on the endpoint through FIleWave. This tab will only show for iOS device types.
PDFs are the most common type of media delivered to endpoints, and the PDFs (once installed) will show in the Books app. You can get to the Media tab at the following url: https://my.server.address/devices/<fw_device_id>/media
Just click on the Media tab to access the data reported from the endpoint. As with all inventory, the data shown is accurate as of the last data submission from the device.