Андрей Слащинин

'@picture' => '/uploaded/',
'@upload' => '@app/web/uploaded/',

$file = UploadedFile::getInstance($this, $code);
$filePath = time() . '_' . $file->baseName . '.' . $file->extension;
$file->saveAs('@upload/' . $filePath);

'modules' => [
    'bootstrap' => ['gii','debug'],
    'gii' => [
        'class' => \yii\gii\Module::className(),
        'allowedIPs' => ['Ваш IP']
    ],
    'debug' => \yii\debug\Module::className(),
    // ..........
],