I have a Samsung Series 7 RU7100 4K UHD LED LCD about 12 months old, when searching the USB for Movies etc the thumbnails are mostly black although some show a snipet from the movie.

I use mostly mp4 format and using Mp3 edit I have added thumbnails in tags which work fine on windows, android and Ios devices but not the tv.

Its ok for me but the grandkids still pick by thumbnail, is there someway of doing this ?

Thanks Thomo