(In reply to Sergio Costas from comment #52)
> The patch has landed in upstream today.

I mean: it has been merged today.

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https://bugs.launchpad.net/bugs/1971168

Title:
  [snap] Files on local network shares are not opened / written

Status in Mozilla Firefox:
  Confirmed
Status in firefox package in Ubuntu:
  Triaged
Status in xdg-desktop-portal package in Ubuntu:
  Triaged
Status in xdg-desktop-portal-gnome package in Ubuntu:
  Fix Released
Status in xdg-desktop-portal-gnome source package in Jammy:
  Triaged
Status in xdg-desktop-portal-gnome source package in Lunar:
  Triaged

Bug description:
  [ Impact ]

  When the user is running a containerized application (like the snapped
  Firefox or Chromium), and tries to save a document, the xdg-desktop-
  portal-gnome backend does show remote drives (like SMB or SFTP ones),
  and allows to choose them, but then the save operation fails.

  The previous backend, xdg-desktop-portal-gtk, did work fine in these
  cases, because it returned the local path that corresponded to the
  local file exported by Gvfs using FUSE, so this behaviour is not only
  a serious bug, but also a regression.

  [ Test plan]
  Steps to reproduce:

  1. Run Firefox or Chromium as a Snap package in Ubuntu 22.04
  2. Have a SMB file server available where the network shares can be mounted 
just by clicking on the share in Nautilus file manager (smb:// protocol, 
usually mounted dynamically via `/var/run/user/.../gvfs/...`)
  3. Have one such share mounted and writable
  4. Open any website containing images in Firefox / Chromium
  5. Right-click on an image and select "Save Image As..."
  6. In the file save dialog, navigate to the mounted share
  7. Assert content of network share is visible and browsable from within the 
save dialog
  8. Select "Save" at any folder in the network share

  Actual behavior:

  * File is not saved to selected network share location
  * No download entry is created
  * No error is shown

  Expected behavior:

  * File is saved to selected network share location
  * No error is shown

  [ Where problems could occur ]

  - If the remote drives aren't exported as local files by Gvfs using
  FUSE, the patch won't work and the behaviour will be the same than
  now.

  - Any hidden  bug in g_file_get_path() when managing remote drives
  could be triggered by this patch.

  [ Additional information ]

  * When saving to a folder on the local machine instead, saving works 
correctly as expected
  * In contrast to files, new folders that are created from within the save 
dialog are saved correctly on the network share
  * Similar situation when trying to open a file with Ctrl + O on a network 
share from Firefox / Chromium. After double-clicking e.g. an image file in the 
file dialog, the file dialog closes but nothing happens otherwise. Opening an 
image on a local folder works fine.

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