TNAS mobile 3 is a dedicated mobile APP for TerraMaster TNAS devices, it can only work with TNAS device running TOS 5.1.79 or later version. With TNAS mobile 3, you can access TNAS locally and remotely on mobile devices, back up photos and videos from mobile devices, browse office or PDF documents, upload or download files, browse and play multimedia files, and manage your TNAS device from your mobile.