Yii2 editing news with photo?

Question

Yii

I did it like this:
Model:

namespace backend\models;

use Yii;
use yii\behaviors\SluggableBehavior;
use yii\db\ActiveRecord;

class Info extends ActiveRecord
{
    public $img_previewT;
    public $img_mainT;

    public $img_preview_name;
    public $img_main_name;

    public static function tableName()
    {
        return '{{info}}';
    }

    public function rules()
    {
        return [
            [['title', 'preview', 'description_seo'], 'filter', 'filter' => 'trim'],
            [['title', 'preview', 'description_seo'], 'filter', 'filter' => 'strip_tags'],
            [['title', 'preview', 'description'], 'required'],
            ['slug', 'safe'],
            [['img_main', 'img_preview'], 'safe'],
            [['img_previewT', 'img_mainT'], 'safe'],
        ];
    }

    public function attributeLabels()
    {
        return [
            'title' => 'Заголовок',
            'preview' => 'Превью',
            'img_previewT' => 'Превью фотографии',
            'img_mainT' => 'Основная фотография',
            'description' => 'Описание',
            'description_seo' => 'Description (SEO)',
        ];
    }

    public function uploadPreview()
    {
        if (is_object($this->img_previewT) && $this->img_previewT->error === 0) {
            $this->img_preview_name = md5(uniqid(rand(),true));

            $this->img_previewT->saveAs(Yii::getAlias('@frontend') . '/web/images/info/' . $this->img_preview_name . '.' . $this->img_previewT->extension);

            $this->img_preview_name = '/images/info/' . $this->img_preview_name . '.' . $this->img_previewT->extension;

            return true;
        } else {
            return false;
        }
    }

    public function uploadMain()
    {
        if (is_object($this->img_mainT) && $this->img_mainT->error === 0) {
            $this->img_main_name = md5(uniqid(rand(),true));
            $this->img_mainT->saveAs(Yii::getAlias('@frontend') . '/web/images/big_info/' . $this->img_main_name . '.' . $this->img_mainT->extension);

            $this->img_main_name = '/images/big_info/' . $this->img_main_name . '.' . $this->img_previewT->extension;

            return true;
        } else {
            return false;
        }
    }

    public function behaviors()
    {
        return [
            [
                'class' => SluggableBehavior::className(),
                'attribute' => 'title',
                'ensureUnique' => true,
            ],
        ];
    }

Controller:

public function actionAdd()
{
    $model = new Info();

    if ($model->load(Yii::$app->request->post())) {
        $model->img_mainT = UploadedFile::getInstance($model, 'img_mainT');
        $model->img_previewT = UploadedFile::getInstance($model, 'img_previewT');

        if ($model->uploadMain()) {
            $model->img_main = $model->img_main_name;
        }

        if ($model->uploadPreview()) {
            $model->img_preview = $model->img_preview_name;
        }

        if ($model->save()) {
            Yii::$app->session->setFlash('success', 'Информация добавлена!');
            return $this->refresh();
        }

        Yii::$app->session->setFlash('error', 'Не удалось добавить информацию!');

    }

    return $this->render('add', compact('model'));
}

public function actionEdit($id) {
    $model = Info::find()->where(['id' => $id])->one();

    if ($model->load(Yii::$app->request->post())) {
        $model->img_mainT = UploadedFile::getInstance($model, 'img_mainT');
        $model->img_previewT = UploadedFile::getInstance($model, 'img_previewT');

        if ($model->uploadMain()) {
            $model->img_main = $model->img_main_name;
        }

        if ($model->uploadPreview()) {
            $model->img_preview = $model->img_preview_name;
        }

        if ($model->save()) {
            Yii::$app->session->setFlash('success', 'Информация обновлена!');
            return $this->refresh();
        }

        Yii::$app->session->setFlash('error', 'Не удалось обновить информацию!');

    }

    return $this->render('edit', compact('model'));
}

That is, I separately check whether the photo is uploaded separately and, if necessary, fill in the required attribute for saving, is this the norm?