I need some help with VPS and cpanel

Hello,I am a total newbie, I have a site which runs on a centos 7 VPS and I have cpanel as my control panel.
The problem is, I need to upload a file to a subfolder under a domain root. How do I do that? I tried to use cpanel file manager but everything just goes to the /home/user directory.

I guess I need the files to be available under domain.com/files e.g.