Script to automatically transfer a file from the site directory to the root directory?

Question

1C-Bitrix

The site uploads information to an XML file and puts it in the /upload/xml directory of the site.
How can you implement the transfer of such files to the root directory as soon as they appear.
the option of periodically checking /upload/xml for the presence / absence of files does not suit.
Centos 7 server, site on Bitrix.