Administrator / test_1

<?php
use yii\widgets\ActiveForm;
?>
    <div class="catalog-view">
<?php $form = ActiveForm::begin(['options' => ['enctype' => 'multipart/form-data']]) ?>

<?= $form->field($model, 'file')->fileInput() ?>

<button>Прочитать</button>

<?php ActiveForm::end() ?>
        </div>