Show us your Gradle tasks

copyall.gradle

task('copyAll') {
    android.applicationVariants.all { variant ->
        variant.outputs.each { output ->
            if (!output.outputFile.name.contains('unsigned')) {
                task("copy${variant.name.capitalize()}", type: Copy) {
                    from(output.outputFile)
                    into("/path-to-your-prefered-folder/")
                }
                dependsOn("copy${variant.name.capitalize()}")
            }
        }
    }
}