I have version 5.5.11
I updated FusionPBX
cd /var/www/fusionpbx
sudo -u www-data git pull
php core/upgrade/upgrade.phps
I edited /etc/php/8.2/fpm/php.ini and verified post_max_size, upload_max_filesize, max_input_vars were written.
I ran all Advanced > Upgrade options
I systemctl restart...