There is a client which downloads the file with POST request.
The names of files are sometimes in Russian. And when the files arrive on the server - it does not save them.
Can somehow fix it without changing the client?
I understand that it is possible in the client to make changes - such as adding a transliteration before downloading, but at the moment there is only the possibility to change the server part.
The file is saved in a standard manner:
move_uploaded_file($_FILES["filename"]["tmp_name"], $upload_dir_name . '/' . $ClientName . "/" . $ContentTypeDir . '/' . $file_name);
The name of the file actually looks on the server at the time of transfer like this: