I am not sure if this was associated with a firmware upgrade or a Windows upgrade but I was able to see the EX2100 in File Explorer and then one day it was just in Media and Storage. I have searched the forum and made sure that Windows Feature SMB 1.0/CIFS File Sharing Support was turned on for all the selections. Still no EX2100 under Network.
Any ideas on what else might be causing this? It is only on Windows 10 running WiFi. A Mac Mini attached directly to the router via CAT5 can see all the shares in the Finder. I can also use SmartWare for backups on my Windows 10 laptop and can access the dashboard via a browser.