That sound reasoable. I merely did what Android Studio suggested to me. Maybe it didn't suggest the latest version because Android Studio itself is not up-to-date (I've installed from flathub and apparently the newest version isn't there yet)
Yeah, that matches my experience (studio 3.0.1 will recommend plugin 3.0.1, etc.).
Mind, I just tried out version 3.1.2 - it doesn't seem to like the build environment:
* What went wrong: A problem occurred evaluating root project 'kdeconnect-android'. > Failed to apply plugin [id 'com.android.application'] > Configuration on demand is not supported by the current version of the Android Gradle plugin since you are using Gradle version 4.6 or above. Suggestion: disable configuration on demand by setting org.gradle.configureondemand=false in your gradle.properties file or use a Gradle version less than 4.6.
That should be easy enough to resolve with a gradle.properties file, like as described by https://stackoverflow.com/a/49994951