The NVIDIA SHIELD supports SMB network protocol for network file sharing. If "Windows File Service" is not enabled on your Synology NAS device, you will receive an error message when attempting to connect to one of your Synology network shared folders. To enable the SMB network protocol, please consult the Synology FAQ below:
https://www.synology.com/en-us/knowledgebase/DSM/help/DSM/AdminCenter/file_winmacnfs_win