Texture turn black and Gameobject become half or unseen-able

Dear All I have created this environment, in which I have used imported mountain and while playing in unity editor and unity remote everything works fine but when build the result get negative and texture of mountains get black and even they do not appear fully. these mountains are using snowtop shadder. The results are shown below. first one is on unity remote app in android second one is build apk installed in android