Panasonic and DLNA with Plex



I have a Pansonic smart tv of 2017, the 40ex703.
The Panasonic tv app store is very poor and there is not Plex. Moreover Plex seems not to recognize the smart tv as a "castable" device. Fortunately, I can manage this with the chromecast.
My problem is the DLNA which should work. By browsing through the device, my Pansonic tv recognizes the Plex server, I can see the folder but when I open them I get an error about the DLNA. On the contrary, by using the Kodi server I have no problem to browser through the folder and play the movies.

Is there an setting to modify in order to allow the dlna file sharing?

Ty in advice,