I must say the settings for this phone are not very direct at all but I did find where to shut off video auto play. Open up a video on your phone. Any video and let it start playing. You will see the vertical 3 dots up in the right hand corner of the videos screen. Click on it and select settings in the drop down menu. It will take you to the video player settings where you can switch off autoplay. Let me know if this helps.
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