Texture packs,shaders and add-ons from websites don't work on Minecraft bedrock edition on my tablet

So on my tablet the Kindle fire hd 10 11th generation the internet app is called silk browser and I use silk browser for downloading custome skins and maps and add-ons and shaders so when I imported shaders and add-ons and then I go onto settings on the game and I got to global resources and on world settings and I activate the shaders and add-ons and then I press back to the main menu theres a problem with shaders and add-ons when I activated them and I press back to the main menu that is the shaders and add-ons don't charge how the game looks at all so both shaders and add-ons maybe are broken or disabled idk and I wanna use shaders and add-ons cause they are fun to use.