If the video format is supported, you should be able to just go to Source>USB Device and then go to the file and click okay to play. Are you getting an error code?
Not all models support all formats, please provide the full model code so that we can look into this for you.
My TV is a Samsung Model UN60F6300AFXZA. The error code is something like "No compatible format available". As I remember, both MPG and MP4 are supported.
Have you updated your unit recently?
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