There are a couple more steps in the set-up. With PC Share Manager, you need to sync the newly-selected folders. You also need to authorise the TV's access permissions through "Set Device Policy" on the Windows PC. This was set out in the User Guide for my B-series set, but I think at least some of the newer guides have omitted it. This might help:
I can't activate the DLNA feature.
I have installed the software on my PC and shared a folder but, I can't see the folder on the TV.
Is it possible that the TV arrived without that DLNA feature installed?
Ho do I verify that?