samsung s7 how to change default video player

like clearing defaults in 'Gallery' and 'Internet and other stuff) But another thing. But i cant find how to change the default video player (as i said ive been searching for a few days and none of the things have worked. I cant remember but it said it was for the ace so i got it.

Ive come to the conclusion that i need to get a different video player to try and fix this, so i got MX player and a Codec. I considered '3' the network had decided i no longer get to play videos as i watch too much, but that wasnt it either as i can still browse the internet and watch other videos and watch youtube videos etc. I looked up online ways to fix this, Clearing history, cache, location all that stuff didnt work, neither did a reboot, My internet speed doesnt affect it as ive been in 3 different locations ever since this happened (and also used 3g). 'Sorry this video cannot be played' (Thats really weird considering the fact i was just watching it.) I was streaming my favourite tv show online when this appears out of nowhere. Ok so i have been searching over and over for the past few days on how to play this video on my Samsung galaxy ace phone.

Samsung s7 how to change default video player