Videos will not open

I had recently transferred videos from my computer that were taken with my old iphone to my s7. The videos do not appear in my pictures, however if I go into my files I can see the videos. When I try to open them I get the message ""unable to find application to perform this action". I'm still figuring out android devices so am I missing a video player or something? I find it odd the videos won't show up in the gallery. Everything goes onto my sd card. Thank you in advance for any help!

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