Hello,
i have a Joomla 3.6.5 website with Jevents and Custom Fields plugin.
I already have custom fields in my Event area.
I tried to add a custom field (copy from another that already exists in this xml file) via xml file but when i upload it, my site broke.
The error was "The xml file is not uploaded."

What am i doing wrong? Is there any configuration i must change?

Thank you very much.