The full M-Series Manual can be found at this link:
https://cdn.vizio.com/user-manual/PDF/2019/TV/UM/M557-G0_M657-G0_UM-ENG.pdf
According to TechHive, Vizio M-Series TVs have one USB 2.0 port on the back. It is outlined in red in the illustration below:
https://www.techhive.com/article/584048/vizio-m-series-quantum-review-2.html
The ports residing on the back of the unit include two HDMI 2.0b, optical digital audio output, analog RCA audio output, coaxia, and ethernet facing downward. A USB port, two HDMI ports, and composite inputs face to the side. Smart of Vizio to make the least permanent connections the easiest to get to.
Playing the USB from the Vizio SmartCast Homepage
The Vizio manual says:
"3. Select USB from the bottom streaming icons on the SmartCast Homepage."
This video shows how to find the USB in the Vizio Smartcast.
Move ahead on the video to 1:20 minutes:
Play the BillionDollarArtGallery video to experience the paintings, captions and music at the same time.
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