Software installed using Flatpack miss directories

I installed KiCad ( using Flatpak. When I try to open old files few folders are visible.

and several are missed, including /mnt/ where I mount a partition containing my old files.
I don’t find any way to manual write path then KiCad is unusable.
I had other packages installed using Flatpak (Signal desktop) that works normally because it uses Dolphin to access files and directories.

  • _OpenMandriva Lx version:_4.3

  • Desktop environment (KDE, LXQT…): KDE

Installed Flatseal that’s available as Flatpack package.
It’s not so difficult to understand settings. Added /mnt/ in Filesystem → Other files and now I can access my old projects.

See also Installed using Flatpack miss directories - Software - Forums