Configuration of Web-access

[LeoBarra]

i'm having some problem to config Web-access with LS220DECD0 and router TPLINK TL-WR841N
in particular it works if i'm connected to my wifi or LAN connection but when i'm away it doesn't work.

I found my NAS in UpnP devices on Router configuration page, but it seems not working.
I followed any kind of guide and manual but i can't find any solution.
Anyone can help me?
Please LB

[Texturtle]

Not all routers work with the UPnP option. Try this:

https://www.buffalotech.com/knowledge-base/setting-up-webaccess-on-a-buffalo-linkstation