As long as the original images are connected and accessible using Lightroom you won't use the smart previews. The smart previews are designed to be used and accessed when the full images have been disconnected.
Thanks for the reply Jim.
From the Julienne Kost's blog post and various videos I understand that if the original images are online, I should ideally see "Original Image + Smart Previews" under the histogram. No?
In the meanwhile, I'm shutting down my NAS. Lets see ...
I do have the exact same problem, and i wonder if you have found a way to solve yours (or get around it) ...
I forgot that I had answered that previous thread. Personally, I don't use smart previews because I don't work on a laptop. And when using smart previews I don't have access to Photoshop or other external editors. So my knowledge about using smart previews isn't as sharp as it should be. I apologize for any misleading remarks I may have made.