Hi,
I'm a newbie myself however, I think the solution is relatively simple.
Bare in mind that your smart TV is a conduit to stream files from your PC.
So, all changes should conducted at the PC end.
I'm using windows 7 with the smart share program located in the Icon box.
smart share should've been installed on your PC when you first installed the smart share software.
1: Make any changes you want to your movies, pictures and music files
2: Double click the smart share icon to pen the smart share program
3: Click My Shared Content on the left which will list any folder (you can select any dive you have and any folder)
to add a folder click the green plus folder icon top left, to remove click the minus folder.
If not already done so Add folders