Administrator / test_2

<?php
namespace backend\models;

use yii\base\Model;
use yii\web\UploadedFile;

/**
 * UploadForm is the model behind the upload form.
 */
class UploadForm extends Model
{
    /**
     * @var UploadedFile file attribute
     */
    public $file;
    public $file_three;

    /**
     * @return array the validation rules.
     */
    public function rules()
    {
        return [
            [['file','file_three'], 'file'],
        ];
    }
}