diff --git a/data/org.freedesktop.portal.Notification.xml b/data/org.freedesktop.portal.Notification.xml
index 1c068b6dc..a4fa4ead3 100644
--- a/data/org.freedesktop.portal.Notification.xml
+++ b/data/org.freedesktop.portal.Notification.xml
@@ -118,6 +118,7 @@
             Target parameter to send along when activating the action.
       -->
     <method name="AddNotification">
+      <annotation name="org.gtk.GDBus.C.UnixFD" value="true"/>
       <arg type="s" name="id" direction="in"/>
       <arg type="a{sv}" name="notification" direction="in"/>
     </method>
diff --git a/src/notification.c b/src/notification.c
index ccceac17a..3876cfe99 100644
--- a/src/notification.c
+++ b/src/notification.c
@@ -23,6 +23,7 @@
 #include <string.h>
 #include <stdio.h>
 #include <gio/gio.h>
+#include <gio/gunixfdlist.h>
 #include <gio/gunixoutputstream.h>
 
 #include "notification.h"
@@ -107,6 +108,7 @@ struct _CallData {
   char *sender;
   char *id;
   GVariant *notification;
+  GUnixFDList *fd_list;
 };
 
 G_DECLARE_FINAL_TYPE (CallData, call_data, CALL, DATA, GObject)
@@ -124,7 +126,8 @@ call_data_new (GDBusMethodInvocation *inv,
                XdpAppInfo            *app_info,
                const char            *sender,
                const char            *id,
-               GVariant              *notification)
+               GVariant              *notification,
+               GUnixFDList           *fd_list)
 {
   CallData *call_data = g_object_new (call_data_get_type(),  NULL);
 
@@ -134,6 +137,8 @@ call_data_new (GDBusMethodInvocation *inv,
   call_data->id = g_strdup (id);
   if (notification)
     call_data->notification = g_variant_ref (notification);
+  if (fd_list)
+    call_data->fd_list = g_object_ref (fd_list);
 
   return call_data;
 }
@@ -149,6 +154,8 @@ call_data_finalize (GObject *object)
   g_free (call_data->sender);
   if (call_data->notification)
     g_variant_unref (call_data->notification);
+  if (call_data->fd_list)
+    g_object_unref (call_data->fd_list);
 
   G_OBJECT_CLASS (call_data_parent_class)->finalize (object);
 }
@@ -346,9 +353,50 @@ parse_buttons (GVariantBuilder  *builder,
   return result;
 }
 
+static gboolean
+parse_serialized_fd_icon (GVariantBuilder  *builder,
+                          GVariant         *handle,
+                          XdpAppInfo       *app_info,
+                          GUnixFDList      *fd_list,
+                          GError          **error)
+{
+  int fd_id, fd;
+  g_autofree char *path = NULL;
+  GVariant *serialized_file_icon = NULL;
+
+  if (!check_value_type ("file-descriptor", handle, G_VARIANT_TYPE_HANDLE, error))
+    return FALSE;
+
+
+  fd_id = g_variant_get_handle (handle);
+  fd = g_unix_fd_list_get (fd_list, fd_id, error);
+
+  if (fd == -1)
+    return FALSE;
+
+  path = xdp_app_info_get_path_for_fd (app_info, fd, 0, NULL, NULL, error);
+  close (fd);
+
+  if (path == NULL)
+    return FALSE;
+
+  /* This is a serialized GFileIcon but there is no point in creating an object and then deserializing it */
+  serialized_file_icon = g_variant_new ("(sv)",
+                                        "file",
+                                        g_variant_new_take_string (g_steal_pointer (&path)));
+
+  if (xdp_validate_serialized_icon (serialized_file_icon, FALSE, NULL, NULL))
+    g_variant_builder_add_value (builder, serialized_file_icon);
+
+  return TRUE;
+}
+
+
 static gboolean
 parse_serialized_icon (GVariantBuilder  *builder,
                        GVariant         *icon,
+                       XdpAppInfo       *app_info,
+                       GUnixFDList      *fd_list,
                        GError          **error)
 {
   const char *key;
@@ -369,6 +417,8 @@ parse_serialized_icon (GVariantBuilder  *builder,
           g_prefix_error (error, "invalid icon: ");
           return FALSE;
         }
+      if (xdp_validate_serialized_icon (value, FALSE, NULL, NULL))
+        g_variant_builder_add_value (builder, value);
     }
   else if (strcmp (key, "bytes") == 0)
     {
@@ -377,6 +427,16 @@ parse_serialized_icon (GVariantBuilder  *builder,
           g_prefix_error (error, "invalid icon: ");
           return FALSE;
         }
+      if (xdp_validate_serialized_icon (value, FALSE, NULL, NULL))
+        g_variant_builder_add_value (builder, value);
+    }
+  else if (strcmp (key, "file-descriptor") == 0)
+   {
+      if (!parse_serialized_fd_icon (builder, value, app_info, fd_list, error))
+        {
+          g_prefix_error (error, "invalid icon: ");
+          return FALSE;
+        }
     }
   else
     {
@@ -384,15 +444,14 @@ parse_serialized_icon (GVariantBuilder  *builder,
       return TRUE;
     }
 
-  if (xdp_validate_serialized_icon (value, FALSE, NULL, NULL))
-    g_variant_builder_add_value (builder, value);
-
   return TRUE;
 }
 
 static gboolean
 parse_notification (GVariantBuilder  *builder,
                     GVariant         *notification,
+                    XdpAppInfo       *app_info,
+                    GUnixFDList      *fd_list,
                     GError          **error)
 {
   int i;
@@ -416,7 +475,7 @@ parse_notification (GVariantBuilder  *builder,
         }
       else if (strcmp (key, "icon") == 0)
         {
-          if (!parse_serialized_icon (builder, value, error))
+          if (!parse_serialized_icon (builder, value, app_info, fd_list, error))
             return FALSE;
         }
       else if (strcmp (key, "priority") == 0)
@@ -464,7 +523,8 @@ add_in_thread_finished_cb (GObject      *source_object,
   if (g_task_propagate_boolean (G_TASK (result), &error))
     {
       xdp_dbus_notification_complete_add_notification (XDP_DBUS_NOTIFICATION (source_object),
-                                                       call_data->inv);
+                                                       call_data->inv,
+                                                       NULL);
     }
   else
     {
@@ -500,7 +560,11 @@ handle_add_in_thread_func (GTask        *task,
 
   g_variant_builder_init (&builder, G_VARIANT_TYPE_VARDICT);
 
-  if (!parse_notification (&builder, call_data->notification, &error))
+  if (!parse_notification (&builder,
+                           call_data->notification,
+                           call_data->app_info,
+                           call_data->fd_list,
+                           &error))
     {
       g_variant_builder_clear (&builder);
 
@@ -523,6 +587,7 @@ handle_add_in_thread_func (GTask        *task,
 static gboolean
 notification_handle_add_notification (XdpDbusNotification *object,
                                       GDBusMethodInvocation *invocation,
+                                      GUnixFDList *fd_list,
                                       const char *arg_id,
                                       GVariant *notification)
 {
@@ -531,7 +596,12 @@ notification_handle_add_notification (XdpDbusNotification *object,
   g_autoptr(GError) error = NULL;
   CallData *call_data;
 
-  call_data = call_data_new (invocation, call->app_info, call->sender, arg_id, notification);
+  call_data = call_data_new (invocation,
+                             call->app_info,
+                             call->sender,
+                             arg_id,
+                             notification,
+                             fd_list);
   task = g_task_new (object, NULL, add_in_thread_finished_cb, NULL);
   g_task_set_task_data (task, call_data, g_object_unref);
   g_task_run_in_thread (task, handle_add_in_thread_func);
@@ -571,7 +641,12 @@ notification_handle_remove_notification (XdpDbusNotification *object,
                                          const char *arg_id)
 {
   Call *call = call_from_invocation (invocation);
-  CallData *call_data = call_data_new (invocation, call->app_info, call->sender, arg_id, NULL);
+  CallData *call_data = call_data_new (invocation,
+                                       call->app_info,
+                                       call->sender,
+                                       arg_id,
+                                       NULL,
+                                       NULL);
 
   xdp_dbus_impl_notification_call_remove_notification (impl,
                                                        xdp_app_info_get_id (call->app_info),
diff --git a/src/xdp-utils.c b/src/xdp-utils.c
index eb59444a4..3cfb4058d 100644
--- a/src/xdp-utils.c
+++ b/src/xdp-utils.c
@@ -2296,6 +2296,7 @@ xdp_validate_serialized_icon (GVariant  *v,
   g_autoptr(GIcon) icon = NULL;
   GBytes *bytes;
   __attribute__((cleanup(cleanup_temp_file))) char *name = NULL;
+  g_autofree char *path = NULL;
   xdp_autofd int fd = -1;
   g_autoptr(GOutputStream) stream = NULL;
   int status;
@@ -2327,11 +2328,6 @@ xdp_validate_serialized_icon (GVariant  *v,
       return TRUE;
     }
 
-  if (!G_IS_BYTES_ICON (icon))
-    {
-      g_warning ("Unexpected icon type: %s", G_OBJECT_TYPE_NAME (icon));
-      return FALSE;
-    }
 
   if (!g_file_test (icon_validator, G_FILE_TEST_EXISTS))
     {
@@ -2339,29 +2335,47 @@ xdp_validate_serialized_icon (GVariant  *v,
       return FALSE;
     }
 
-  bytes = g_bytes_icon_get_bytes (G_BYTES_ICON (icon));
-  fd = g_file_open_tmp ("iconXXXXXX", &name, &error);
-  if (fd == -1)
+  if (G_IS_BYTES_ICON (icon))
     {
-      g_warning ("Icon validation: %s", error->message);
-      return FALSE;
-    }
+      bytes = g_bytes_icon_get_bytes (G_BYTES_ICON (icon));
+      fd = g_file_open_tmp ("iconXXXXXX", &name, &error);
+      if (fd == -1)
+        {
+          g_warning ("Icon validation: %s", error->message);
+          return FALSE;
+        }
 
-  stream = g_unix_output_stream_new (fd, FALSE);
+      stream = g_unix_output_stream_new (fd, FALSE);
 
-  /* Use write_all() instead of write_bytes() so we don't have to worry about
-   * partial writes (https://gitlab.gnome.org/GNOME/glib/-/issues/570).
-   */
-  bytes_data = g_bytes_get_data (bytes, &bytes_len);
-  if (!g_output_stream_write_all (stream, bytes_data, bytes_len, NULL, NULL, &error))
-    {
-      g_warning ("Icon validation: %s", error->message);
-      return FALSE;
+      /* Use write_all() instead of write_bytes() so we don't have to worry about
+       * partial writes (https://gitlab.gnome.org/GNOME/glib/-/issues/570).
+       */
+      bytes_data = g_bytes_get_data (bytes, &bytes_len);
+      if (!g_output_stream_write_all (stream, bytes_data, bytes_len, NULL, NULL, &error))
+        {
+          g_warning ("Icon validation: %s", error->message);
+          return FALSE;
+        }
+
+      if (!g_output_stream_close (stream, NULL, &error))
+        {
+          g_warning ("Icon validation: %s", error->message);
+          return FALSE;
+        }
     }
+  else if (G_IS_FILE_ICON (icon) && !bytes_only)
+    {
+      path = g_file_get_path (g_file_icon_get_file (G_FILE_ICON (icon)));
 
-  if (!g_output_stream_close (stream, NULL, &error))
+      if (!path)
+        {
+          g_warning ("Icon validation: Invalid icon path");
+          return FALSE;
+        }
+    }
+  else
     {
-      g_warning ("Icon validation: %s", error->message);
+      g_warning ("Unexpected icon type: %s", G_OBJECT_TYPE_NAME (icon));
       return FALSE;
     }
 
@@ -2369,7 +2383,7 @@ xdp_validate_serialized_icon (GVariant  *v,
   args[1] = "--sandbox";
   args[2] = MAX_ICON_SIZE;
   args[3] = MAX_ICON_SIZE;
-  args[4] = name;
+  args[4] = (name) ? name : path;
   args[5] = NULL;
 
   if (!g_spawn_sync (NULL, (char **)args, NULL, 0, NULL, NULL, &stdoutlog, &stderrlog, &status, &error))