Can't mount network drive to Raspberry Pi 3

I recently had to change my home router. Was a Netgear model and replaced it with a Linksys. With the old router, I had no issues getting my Raspberry Pi 3 with Volumio to stream across the network, but I cannot get it to work with the Linksys.

I have the HD with my music files plugged into the router and I can access them remotely through my Windows 10 laptop. When I do a network scan in the Volumio Sources menu, it sees the drive, but tells me the host is down every time I try to connect. I’ve used the router name and it’s IP address, with and without the username & password, but keep getting the same message. Any ideas how to fix this?