Problems getting instance of UploadedFile in Yii2
PHP Snippet 1:
// View
<?= $form->field($model, 'arch')->fileInput(); ?>
// Controller
$model->arch = UploadedFile::getInstanceByName('arch');
PHP Snippet 2:
'options' => ['enctype' => 'multipart/form-data']
PHP Snippet 3:
$names = UploadedFile::getInstances($model, 'filename');