title: Unity - compressed .jpg and .png files get uncompressed when building apk
body: <p>In my 2d game, I have about <strong>20 background images</strong>, that i've turned into <strong>.jpg</strong> files (Edit: and also compressed them). Their total size is around <strong>9MB</strong>, but for some reason, <strong>when I build the apk, they get uncompressed</strong> and they take up a lot more space. <strong>How to prevent this?</strong> Thank you!</p>
  
  <p>Edit: new issue</p>
  
  <blockquote>
    <p>Some little triangles appear on my buttons, only in-game.</p>
  </blockquote>
  
  <p>This is what I see in the scene (and should see in-game):
  <a href="https://i.stack.imgur.com/8AjCD.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/8AjCD.png" alt="enter image description here"></a></p>
  
  <p>This is what I see in-game (circles added later):
  <a href="https://i.stack.imgur.com/sOzfu.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/sOzfu.png" alt="enter image description here"></a></p>
  
  <p><strong>Why is this caused and how can i fix this problem?</strong></p>
  
  <p>Thank you</p>