Kartik Gridview export config?

I am using Kartik Gridview. Export is also working fine, but summary data is not getting exported, but showing fine in the view. As also I want to change the filename of the downloaded file.

I have tried this code, but nothing seems to be working

<?= GridView::widget([

        'dataProvider' => $dataProvider,

        'filterModel' => $searchModel,

        'columns' => $gridColumns,        

        'showPageSummary' => true,

        'exportConfig'=> [


        'filename' => Yii::t('kvgrid', 'Appointments'),

        'showPageSummary' => true,




That is I have added the export config in the gridview widget but it doesn’t seems to be working.

What I am doing wrong here? please suggest any changes.