In controller and view you must specify a temporary files name as array. Filepond will create temporary directory for each uploaded file.
View
<?php Html::beginForm(['upload/store']); ?>
.......
<?= FilepondWidget::widget([
'name' => 'file[]',
'multiple' => true
]);
?>
.......
<?php Html::endForm(); ?>
Controller
public function actionStore()
{
$fileDirs = \Yii::$app->request->post('file');
foreach ($fileDirs as $fileDir) {
$path = \Yii::$app->getModule('filepond')->basePath . $fileDir;
// uploaded file is in the $path directory
.......
}
}