(Onlyoffice) Word.docx document is not saving

Hello, when I create a new onlyoffice document work on it and then save it works when I open it again. But when I download the document it shows me nothing it’s just empty.

I already added ‘onlyoffice’ => [‘verify_peer_off’ => TRUE], to the config.php file but it doesn’t help.

Please tell me what I have to do to solve the problem.