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Re:Flatpak – a security nightmare – 2 years later (2020) by its-summertime on Sunday March 21, 2021 @06:22AM (#26529409)
specifically, anything that uses the generic GTK/Qt way of accessing files via the file chooser will automagically use the portal

Anything that tweaks on that, most notably Electron, will not use the portal

Re:Flatpak – a security nightmare – 2 years later (2020) by akvadrako on Sunday March 21, 2021 @06:30AM (#26529433)
That's a choice of Electron - it could and should use portals.