Android - Design your app for tablets optimization tip on Google Play

Hi!

We have an app that has been designed for tablets. When we upload a production apk to the Google Play store, we're getting a message in the optimization tips about designing our app for tablets. The specific message is "Your APK should include custom drawables assets for common tablet screen densities." Looking at the project in android studio, it looks like Unity has already added the required drawable folders for different screen densities. These folders only contain our app icon. Does anyone know what else we need to do to fulfill this criteria?

Thanks in advance!