title: My API level in Unity is 0
body: <p>I have installed android-sdk on my computer. My API level is 27 but when I want to build an android app in Unity I have an error that says The minimum API level you need is 23 but the android API level on my computer is 0.
  I have uninstalled and reinstalled the android SDK. I changed the name of my android folder in the tools folder from android 8.0.1 to android_23 and android_27.</p>
  
  <p>I changed the folder of android SDK.</p>
  
  <p>I don't have android studio on my PC.</p>
  
  <p>I don't know what to do. Help Please.
  <img src="https://i.stack.imgur.com/iygjA.png" alt="sdk manager image"></p>