The Test Case I included in the description is being fixed in Ubuntu 24.10 by having nautilus provide the filechooser used by xdg desktop portals (which is what the Chromium and Firefox snaps use for the filechooser).
** Also affects: xdg-desktop-portal-gnome (Ubuntu) Importance: Undecided Status: New ** Changed in: xdg-desktop-portal-gnome (Ubuntu) Status: New => Fix Committed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2023044 Title: New thumbnails are missing from file chooser To manage notifications about this bug go to: https://bugs.launchpad.net/gtk/+bug/2023044/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs