My iPhone 6s won't play my videos?

I just switched to a 6s from my 5s and I had all my information/ pictures/ videos transferred. Now I have memorable videos from my 5s that are now on my 6s but my 6s won't play them it just sits there with the circle buffering thing. They re just sitting there in the " photos " app. If anyone has any idea why please let me know

Reboot your device and also try to perform a Hard Reset and do Try Leo Privacy Guard if you want to make your mobile absolutely secure.

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