Setting One Signal Small Icon - Google Play

I did it, there are changes but I solved and it worked but how can we use this in google play?
We are not sending apk file to google play but in this tutorial we changed notification settings on apk file. We are sending aab file to google play.

Then after changes made in apk use Edit or Modify the AAB file


I did not know we can convert apk to aab and then sign it. Doesn’t it couse to download somebody elses apk convert to aab, sign and release as your app in google play?