Remote Access Upnp issue

I have gone through the forum and could not find the solution hence a new thread. Till yesterday I was able to get remote access to MyCloud from external (my mob on data connection). But today it stopped. I have enabled UPnP in my router TP-Link WR841N. There is no entry in the UPnP table in router. I saw it come for a moment and disappear. Remote access is enabled and following is the message:

Connection Status Connected (Relay connection established)
For best performance, enable UPnP on your router to establish a direct connection.

Any suggestions?

Restarted the NAS and got this now:
Connection Status Connected
Port forwarding connection established.
Even the entries are visible in UPnP menu of Router
But access through mob still does not get established.

My suggestions on this thread, active today…