Tried changing the root folder and give access by adding this line in /etc/php/7.3/fpm/pool.d/ifm.conf, as mentionned in the readme
env[IFM_ROOT_DIR] = /
Rebooted. Worked! Ah … but no… finally!
Some folders are redirecting me back to root when I open them. I created a video to show you. In this case the wordpress and vaultwarden folder return me to root.
Not that these folder can be oponened without problem with an ssh connection to the server.