Thumbnails for m2ts files appearing on my sony smart tv as blank

I have a Sony KDL-55EX640 smart tv with my WD MyCloud connect by way of my home network. Everything seems to work smoothly except when I go to stream the movies I have ripped from the MyCloud the tv only show an icon of a film clip and then it goes black. I have .jpg thumbnails for the movies (yes with exactly the same name as the video file) in the folder. I had to use the m2ts file format because I couldn’t get the tv to stream anyother type of file (mp4, avi etc). The thumbnails work on my Samsung smart in the bedroom using an Amazon fire stick. Anyone have any ideas? Soryy, any ideas besides buying another fire stick or a new smart tv.:o)