In Windows Media Player 12 go to Library, find Stream menu and select 'Automatically allow devices to play my media'. Then you will be able to see your multimedia files on the TV.
I have a LG 557600 Smart TV - it is a great TV - I love it! I mainly use the 'media link' feature which streams video from my PC which is running Plex media server.
However, there is the 'smart share' app on the TV as well. I can see all my computer listed here, but when I click on it I get an error that says 'unkown error' then it says no file.
Any ideas on this? I know that used to work in the past.