XML files being removed from server

So when I upload an xml file to the server, it looks like Contao removes them automatically from the server when I run the maintenance and purge xml files.

How do I use xml files outside of Contao and keep them on the server so that Contao doesn't remove them?

PS, I've noticed this in 2.11x and maybe it's not an issue in 3?

Contao manages xml files in the root. Only xml files generated by contao are allowed here.

Put your xml files into tl_files/ or try it with a variable in system/config/dcaconfig.php (or maybe in the initconfig.php)

$GLOBALS['TL_CONFIG']['rootFiles'][] = 'myxmlfile.xml';

Thanks Andreas. These are Google and Bing validation codes that look to need to be on the root. I'll give the config stuff a try.