--- filechooser.c.orig	2023-09-28 22:52:29.788289567 +0200
+++ filechooser.c	2023-09-28 22:55:47.430119038 +0200
@@ -214,6 +214,24 @@
   file_dialog_handle_close (handle);
 }
 
+// Copied from https://gitlab.gnome.org/GNOME/totem/blob/master/src/backend/bacon-video-widget.c#L3571
+static char *
+get_target_uri (GFile *file)
+{
+  g_autoptr (GFileInfo) info = NULL;
+  g_autofree char *target = NULL;
+
+  info = g_file_query_info (file, G_FILE_ATTRIBUTE_STANDARD_TARGET_URI, G_FILE_QUERY_INFO_NONE, NULL, NULL);
+  if (info != NULL)
+    {
+      const char *val = g_file_info_get_attribute_string (info, G_FILE_ATTRIBUTE_STANDARD_TARGET_URI);
+      if (val != NULL)
+        target = g_strdup (val);
+    }
+
+  return g_steal_pointer (&target);
+}
+
 static GSList *
 get_uris (GtkFileChooser *filechooser)
 {
@@ -228,6 +246,58 @@
       g_autoptr(GFile) file = g_list_model_get_item (files, i);
       g_autofree char *uri = g_file_get_uri (file);
 
+      /*
+      * Transform 'trash:///' and 'recent:///' URIs into
+      * local ones.
+      */
+     if (g_file_has_uri_scheme (file, "trash") != FALSE ||
+         g_file_has_uri_scheme (file, "recent") != FALSE)
+       {
+         char *target_uri = get_target_uri (file);
+         if (target_uri != NULL)
+           {
+             g_free (uri);
+             uri = g_steal_pointer (&target_uri);
+           }
+       }
+
+      /*
+       * xdg-desktop-portal-gtk shows remote file systems (like
+       * SMB or SSH), and translates their non-local URIs (like
+       * smb:// or ssh://) into local ones (file://) because
+       * gtk_file_chooser_get_uris() from Gtk3 does that job
+       * automagically, using the local path offered by the
+       * FUSE mounts of Gvfsd.
+       *
+       * xdg-desktop-portal-gnome shows these remote FS too, but
+       * the method gtk_file_chooser_get_files() from Gtk4 returns
+       * a list of GFiles instead, and getting the URI value on these
+       * doesn't do that translation; this means that remote SMB or
+       * SSH mounts are shown in the dialog, and the user can choose
+       * files inside them, but the containerized application won't
+       * be able to access them, because xdg-desktop-portal removes
+       * those paths sent by xdg-desktop-portal-XXXX that aren't
+       * locally accesable.
+       *
+       * This piece of code adds the original functionality by asking
+       * to the GFile the local path for all non-file:// URI, offered
+       * by Gvfsd and the FUSE mount.
+       */
+
+      if (g_file_has_uri_scheme (file, "file") == FALSE)
+        {
+          g_autofree char *path = g_file_get_path (file);
+          if (path != NULL)
+            {
+              char *filename_uri = g_filename_to_uri (path, NULL, NULL);
+              if (filename_uri != NULL)
+                {
+                  g_free (uri);
+                  uri = g_steal_pointer (&filename_uri);
+                }
+            }
+        }
+
       uris = g_slist_prepend (uris, g_steal_pointer (&uri));
     }