title: The uploaded APK does not have valid signature Firebase TestLab instrument test type
body: <p>I'm trying to testing with my demo app with firebase test lab with instrument test type but i'm not able to test that due to following error regarding to apk.
  <a href="https://i.stack.imgur.com/krhRQ.png" rel="noreferrer"><img src="https://i.stack.imgur.com/krhRQ.png" alt="enter image description here"></a></p>
  
  <p>I uploaded the <strong>debug-keystore</strong> signed apk there. Even in my other project i also uploaded my own keystore signed apk there with my <strong>androidTest.apk</strong> but same error is showing. Please guide me if i'm missing some major steps. Thanks</p>