As i know PHP on windows have problems with uploading files with unicode characters as file name. But the problem was solved after PHP 7.1
I almost was sure there is no problem with linux server.

I tested with a linux server and unfortunately it did not uploaded unicode characters correctly as file name.
My linux server admin claims that, linux file system does not support UTF-8 characters as filename. PHP server version is 7.1
Is that really right?