files is a symbolic link to /media/files/tb-prod/files. When you access files or anything inside it, you'll really access the path under /media. Symbolic links are made and updated using the ln command. This link could have been made with:
ln -s /media/files/tb-prod/files files
-s means to make a symbolic link. To update a link, either delete the link and create it as above, or use the -f option to ln as well. If you are linking to a folder, you should include the -n option:
ln -sfn /a/new/path files
This will replace the link with a new one pointing at /a/new/path.
The -n option is necessary when linking to a different target folder to avoid creating a sub-folder inside that symbolic link and instead replace the symbolic link completely.
e.g.
contact@me:/mnt/webdav$ ls
a1 a2 a3 a4 a5 a6
contact@me:/mnt/webdav$ ln -sfn /mnt/a2/XYZ a2
contact@me:/mnt/webdav$ ls
a1 a2 a3 a4 a5 a6
contact@me:/mnt/webdav$
https://unix.stackexchange.com/questions/151999/how-to-change-where-a-symlink-points