Help setup Kodi on Sony 2017 with kodi 17.3 krypton

I just buy a tv Sony 65xe93. I install kodi and, for me, it is the first run with this application which is pretty cool.
I have a NAS connected to local network with my movies, which I see with kodi. When i try to load subtitles from audio and subtitles setting don’t find it any.
I browse in the folder where the movie is but there is no subtitles.
Also form my NAS western digital my cloud i cant make a library in the kodi menu
ty