/usr/share/doc/fts-opsi/changelog.Debian.gz is in fts-opsi 1.1-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/fts-opsi/../fts/changelog.Debian.gz
/usr/share/doc/fts-opsi/../fts/changelog.Debian.gz