Zandronum

hello everybody, i've just downloaded zandronum and it's working really well, the only problem that i have is that it does not see my controller, even if support is enabled
i've already tried chocolate doom and my controller is working perfectly out of the box

any help?

for the record, my controller is a retrobit wifi saturn controller, and zandronum is played on fedora workstation 33 via flatpak...

thanks