Flameshot can't save the screenshot and you get this error:

~$ flameshot gui

(flameshot:273151): GVFS-WARNING **: 10:59:28.441: The peer-to-peer connection failed: Timeout was reached. Falling back to the session bus. Your application is probably missing --filesystem=xdg-run/gvfsd privileges.

Kill gvfsd:

~$ killall gvfsd

• Flameshot v11.0.0 (11.0.0-2 Debian)

Compiled with Qt 5.15.2 linux: 6.8.0-45-generic ubuntu: 22.04

• https://askubuntu.com/questions/996949/how-to-restart-gvfs