How to sync folders between a wired connected PC and WiFi laptop?  

Thanks.
Really sorry, but I am not entirely sure what you mean. Is the above different from what I have been trying to accomplish in my last post? I am not an expert.

That aside, one way or the other, as read in my last post: login credentials are required (when launching Windows)
and also when the laptop goes to sleep, it disappears from Explorer tree (last para in my last post).

I guess this might have been a nice solution when Windows on laptop is up and running - i.e. the laptop is not asleep and login password isn't required.