i'm sure this is missing the point but if the aim is to just use your phone while at home (or on the same network as the nas drive) then you can just a file manager app like the built in files or i tend to prefer owl files, and connect to the drives over a network share
if you can create a VPN server on your home network (aware the F2-210 doesnt provide support for creating one so would need either a router that supports incoming VPN, or another device on your network), you can connect your phone to the VPN from anywhere outside of your home and then the files app will work as it will believe its on the same network
this advice is provided in absent of any official terramaster responses to your problem, as i guess my only real response is dont bother using the TM software as i dont use it, and go back to basics with how the nas drive works and do your own thing