Помогите когда билжу проект на юнити mobile

You can find the SDK location from your Android Studio –> File > Settings > Appearance & Behavior > System Settings > Android SDK.
Normally the default location of Android SDK are– Linux: ~/Android/Sdk Mac: ~/Library/Android/sdk Windows: %LOCALAPPDATA%\Android\sdk.
So if Android SDK is not present, make sure that you have installed Stable Android Studio version (Preferably the Latest Stable).