I followed the directions on the upgrading page for using the command line (https://docs.moodle.org/28/en/Upgrading).
Moved my folder which my hosting support says is where the software was installed - moodledata to moodledata.backup. Then unpacked the latest tar file which created a new folder structure named moodle. I renamed that to moodledata so other files which point to that folder wouldn't get confused.
The instructions talked about copying custom mods (I don't have any), .htaccess, config.php, etc. I have more than one of each of those, but they weren't necessarily where I thought they would be based on the documentation.
As I look around my directory structure, I notice there are also many of the same folders and files in /public_html. Is it possible this is where my upgraded files were supposed to go? The public_html tree also has folders for other web applications hosted on this server, so I know it's not exclusive to Moodle.
Are there some sample files you'd like me to attach to help troubleshoot?