title: Samsung Galaxy App Not Installed Exception
body: <p>I am trying to deploy an update of an existing Mobile application &amp; keep getting the following exception:</p>
  
  <blockquote>
    <p>"App Not Installed"</p>
  </blockquote>
  
  <p><strong>Q: What am I doing wrong?</strong><br/>
  <strong>Q: Is there a way to see or activate ERROR messages?</strong><br/></p>
  
  <p><strong>I have the following:</strong></p>
  
  <ul>
  <li>Samsung Galaxy S9+</li>
  <li>42 GB free disk space</li>
  <li>3 GB memory available</li>
  <li>No SD Card</li>
  </ul>
  
  <p><strong>I am using the following APK file:</strong></p>
  
  <ul>
  <li>com.[companyname].pulse.apk</li>
  <li>...in my Phone\Download directory</li>
  <li>...and it shows up in the "Installation Files" listing</li>
  <li>...this is NOT the signed file (is that right?)</li>
  </ul>
  
  <p><strong>I have done the following:</strong></p>
  
  <ul>
  <li>Gone to "Install Unknown Apps" and verified "Allowed" is checked for "My Files"</li>
  <li>The 1st time I accessed it...I was forced to choose "Allowed"...as well</li>
  <li>Enabled "Developer Options" through the "About Device" menu's</li>
  </ul>
  
  <p><strong>I developed using:</strong></p>
  
  <ul>
  <li>Xamarin.Forms (2.5.0.280555))</li>
  </ul>