Why does it return false when trying to move a file?

Question

Phalcon

foreach ($this->request->getUploadedFiles(true) as $file) {
            $file_name = sha1(mt_rand(0, 100) . mt_rand(0, mt_rand(0, 100))) . $file->getName();
            if($file->moveTo($this->config->application->imagesDir . $file_name)){
                $article->preview_img = $file_name;
            }
        }

The file itself is 100% in a temporary folder, I checked it. But nivkakuyu does not want to move to the folder I need. (tried even through the standard php function, the same result)