title: Signed release apk locally transfered can't be installed?
body: <p>Experts,</p>
  
  <p>I have a signed release android apk generated locally in my android studio. I have copied it to my mobile device &amp; tried to install it. But every time it says "App not installed" error. </p>
  
  <p>Am I missing something?</p>
  
  <p>Thanks</p>