I believe once the Storage device is attached to the router, USB drive that is, and configured using the routers management page, it should work well. Items to enable are Storage, DLNA and Enable Multi-case Streaming.
I recommend the following as well:
Setup DHCP reserved IP addresses for all devices ON the router. Setup/Networking. This ensures each devices gets its own IP address when turned on and connected, eliminates IP address conflicts and helps in troubleshooting.
Ensure devices are set to auto obtain an IP address.
Set Firewall settings to Endpoint Independent for TCP and UDP under Advanced/Firewall.