Android publishing unity version 2018.2.6.1

I am trying to load my game to google play. I am getting this error:
You uploaded an APK or Android App Bundle that was signed in debug mode. You need to sign your APK or Android App Bundle in release mode. Learn more about signing.

  • my build screen - the build system is gradle
  • development build is not checked
  • my visual studio is set to release

Any advice

You have to sign the app before it can be uploaded. Just do a quick search on YouTube for Unity to Android App Signing to see the process. Its kind of like embedding a license into the build so that Unity knows you own it.