xdg-desktop-portal-gtk sends a response code essentially indicating that it failed to open the file picker[0] when you close the file picker without using the Cancel button[1]. There does not seem to be any way for the portal to indicate any other kinds of exit conditions aside from success, cancel, or failure[2]. Additionally, Kotatogram[3] and Firefox[4] does not display an error if the portal cannot bring up the file picker. [0]  | 
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| .. | ||
| export.cpp | ||
| export.h | ||
| filters.cpp | ||
| filters.h | ||
| ok_buttons_fragment.h | ||