How do I play videos from a USB drive on my TV?
Connect a USB thumb drive formatted as FAT32 with video files ending in .mp4 extension to the USB port on the TV. The TV will automatically recognize the USB drive and begin playing content, or you can select USB from the SmartCast Homepage. Do not remove the USB drive while the TV is on, as this may damage the drive. (Page 38)
From the official Vizio Factory TV manual, page 38
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