Under a Gnome X11 session, with flatpak apps that use Qt / the KDE runtime, the file portal dialog gets placed behind the application window. I have seen reports where users believe the (maximized) app crashed, because the dialog can't be seen and there's no reaction to input because of the focus change.
OS tested: Fedora 32
apps tested: org.kde.kdenlive, org.shotcut.Shotcut
tested but not affected: Wayland, GTK apps, KDE Plasma / xdg-desktop-portal-kde
Under a Gnome X11 session, with flatpak apps that use Qt / the KDE runtime, the file portal dialog gets placed behind the application window. I have seen reports where users believe the (maximized) app crashed, because the dialog can't be seen and there's no reaction to input because of the focus change.
OS tested: Fedora 32 apps tested: org.kde.kdenlive, org.shotcut.Shotcut tested but not affected: Wayland, GTK apps, KDE Plasma / xdg-desktop-portal-kde