When i download a shader texture pack it doesn't work... and i trayed with 10 different packs

Hi 

I'm a minecraft bedrock player

i play in a windows 10 pc and this is my problem.

Every time that i try to put a shader texture pack it doesn't work, i tryed with ten different packs and it's always the same, the shader only change the sky, making the sun and the moon circular and the clouds more detailed, i want somebody who explain me what can i do. 

waitng for help... C.