LG G6 no video only sound

[Android Central Question]

My LG G6 won't play my recorded video's back in gallery, it only plays sound and I get a little tv with an arrow in it instead of video.

 

[B. Diddy]

Welcome to Android Central! Did you take these videos using the stock Camera app, or did you download from somewhere else? Are the video files saved to Internal Storage or an SD card?