Samsung PN51E6500EFXZA - Manual (Page 180)

N You must select a music file. You
cannot select only a photo file.
N If there is no music file on the USB
device or you don’t select a folder
containing a music file, the Timer
function does not operate correctly.
N If there is only one photo file in the
USB, the slide show will not play.
N If a folder name is too long, the
folder cannot be selected.
N Each USB you use is assigned its