Rewrite custom-audio and custom-timestamps, rename all files

- custom-audio-on-toasts -> custom-audio-on-notifications: remove namespace
  section, XML tab, broken links, add API link to SetAudioUri
- custom-timestamps-on-toasts -> custom-timestamps-on-notifications: remove
  toast NOTE, XML tab, broken links, add API link to SetTimeStamp
- notification-pending-update: rewrite with validated code
- notification-progress-bar: cleanup pass with validated code
- Update all cross-refs in content, index, toc, and redirects

Co-authored-by: Copilot <[email protected]>

Author: drewbatgit

.openpublishing.redirection.json

@@ -9568,14 +9568,24 @@
       "redirect_url": "../../../develop/notifications/choosing-a-notification-delivery-method",
       "redirect_document_id": false
     },
+    {
+      "source_path": "hub/apps/develop/notifications/app-notifications/custom-audio-on-toasts.md",
+      "redirect_url": "custom-audio-on-notifications",
+      "redirect_document_id": true
+    },
+    {
+      "source_path": "hub/apps/develop/notifications/app-notifications/custom-timestamps-on-toasts.md",
+      "redirect_url": "custom-timestamps-on-notifications",
+      "redirect_document_id": true
+    },
     {
       "source_path": "hub/apps/design/shell/tiles-and-notifications/custom-audio-on-toasts.md",
-      "redirect_url": "../../../develop/notifications/app-notifications/custom-audio-on-toasts",
+      "redirect_url": "../../../develop/notifications/app-notifications/custom-audio-on-notifications",
       "redirect_document_id": false
     },
     {
       "source_path": "hub/apps/design/shell/tiles-and-notifications/custom-timestamps-on-toasts.md",
-      "redirect_url": "../../../develop/notifications/app-notifications/custom-timestamps-on-toasts",
+      "redirect_url": "../../../develop/notifications/app-notifications/custom-timestamps-on-notifications",
       "redirect_document_id": false
     },
     {

hub/apps/develop/notifications/app-notifications/app-notifications-content.md

@@ -267,7 +267,7 @@ You can override the system-provided timestamp with your own timestamp that accu
 
 ![Screenshot of a notification in the Notifications Center with a custom timestamp](images/toast-content-custom-timestamp.png)
 
-To learn more about using a custom timestamp, please see [custom timestamps on toasts](custom-timestamps-on-toasts.md).
+To learn more about using a custom timestamp, please see [Custom timestamps on app notifications](custom-timestamps-on-notifications.md).
 
 ### [Windows App SDK](#tab/appsdk)
 
@@ -774,7 +774,7 @@ var builder = new AppNotificationBuilder()
 
 ---
 
-See the [audio schema page](/uwp/schemas/tiles/toastschema/element-audio) for information on audio in app notifications. To learn how to send an app notification that uses custom audio, see [custom audio on toasts](custom-audio-on-toasts.md).
+See the [audio schema page](/uwp/schemas/tiles/toastschema/element-audio) for information on audio in app notifications. To learn how to send an app notification that uses custom audio, see [Custom audio on app notifications](custom-audio-on-notifications.md).
 
 
 ## Scenarios

hub/apps/develop/notifications/app-notifications/custom-audio-on-notifications.md

@@ -0,0 +1,55 @@
+---
+description: Learn how to use custom audio on your app notifications to let your app express your brand's unique sound effects.
+title: Custom audio on app notifications
+label: Custom audio on app notifications
+template: detail.hbs
+ms.date: 07/28/2025
+ms.topic: article
+keywords: windows 11, windows app sdk, winappsdk, notification, custom audio, sound
+ms.localizationpriority: medium
+---
+# Custom audio on app notifications
+
+App notifications can use custom audio, which lets your app express your brand's unique sound effects. For example, a messaging app can use its own messaging sound on app notifications so that the user can instantly know the notification came from that app, rather than hearing the generic notification sound.
+
+For more information about app notifications, see [App notifications overview](index.md).
+
+## Add custom audio
+
+Use [**AppNotificationBuilder.SetAudioUri**](/windows/windows-app-sdk/api/winrt/microsoft.windows.appnotifications.builder.appnotificationbuilder.setaudiouri) to specify a custom audio file for your notification.
+
+```csharp
+using Microsoft.Windows.AppNotifications;
+using Microsoft.Windows.AppNotifications.Builder;
+
+var notification = new AppNotificationBuilder()
+    .AddText("New message")
+    .SetAudioUri(new Uri("ms-appx:///Assets/Audio/CustomToastAudio.m4a"))
+    .BuildNotification();
+
+AppNotificationManager.Default.Show(notification);
+```
+
+Supported audio file types:
+
+- .aac
+- .flac
+- .m4a
+- .mp3
+- .wav
+- .wma
+
+Supported audio file sources:
+
+- ms-appx:///
+- ms-resource
+
+Unsupported file sources:
+
+- ms-appdata
+- http://, https://
+- C:/, F:/, etc.
+
+## See also
+
+- [App notifications overview](index.md)

hub/apps/develop/notifications/app-notifications/custom-audio-on-toasts.md

@@ -0,0 +1,52 @@
+---
+title: Custom timestamps on app notifications
+description: Learn how to override the default timestamp on an app notification with a custom timestamp that indicates when the message or content was generated.
+label: Custom timestamps on app notifications
+template: detail.hbs
+ms.date: 07/28/2025
+ms.topic: article
+keywords: windows 11, windows app sdk, winappsdk, notification, custom timestamp, timestamp, Notification Center
+ms.localizationpriority: medium
+---
+# Custom timestamps on app notifications
+
+By default, the timestamp on app notifications in Notification Center is set to the time that the notification was sent. You can optionally override the timestamp with your own custom date and time so that the timestamp represents the time the message or content was actually created, rather than the time the notification was sent. This also ensures that your notifications appear in the correct order within Notification Center, which is sorted by time.
+
+:::image type="content" source="images/toast-content-custom-timestamp.png" alt-text="App notification with custom timestamp":::
+
+For more information about app notifications, see [App notifications overview](index.md).
+
+## Set a custom timestamp
+
+Use [**AppNotificationBuilder.SetTimeStamp**](/windows/windows-app-sdk/api/winrt/microsoft.windows.appnotifications.builder.appnotificationbuilder.settimestamp) to override the default timestamp on your notification.
+
+```csharp
+using Microsoft.Windows.AppNotifications.Builder;
+
+var notification = new AppNotificationBuilder()
+    .AddText("Matt sent you a friend request")
+    .AddText("Hey, wanna dress up as wizards and ride around on hoverboards?")
+    .SetTimeStamp(new DateTime(2017, 04, 15, 19, 45, 00, DateTimeKind.Utc))
+    .BuildNotification();
+
+AppNotificationManager.Default.Show(notification);
+```
+
+## Usage guidance
+
+We recommend that most apps specify a custom timestamp. This ensures that the notification's timestamp accurately represents when the message or content was generated, regardless of network delays, airplane mode, or the fixed interval of periodic background tasks.
+
+For example, a news app might run a background task every 15 minutes that checks for new articles and displays notifications. Without a custom timestamp, the timestamp corresponds to when the notification was generated (always in 15-minute intervals). With a custom timestamp, the app can set it to the time the article was actually published. Similarly, email apps and social network apps can benefit from this feature if a similar pattern of periodic pulling is used for their notifications.
+
+Providing a custom timestamp also ensures that the timestamp is correct even if the user was disconnected from the internet. For example, when the user turns their computer on and your background task runs, you can ensure that the timestamp represents the time the messages were sent, rather than the time the user turned on their computer.
+
+## Default timestamp
+
+If you don't provide a custom timestamp, the platform uses the time that your notification was sent.
+
+- For push notifications sent through WNS, the timestamp is set to the time when the notification was received by the WNS server.
+- For local notifications, the timestamp is set to the time when the notification platform received the notification.
+
+## See also
+
+- [App notifications overview](index.md)

hub/apps/develop/notifications/app-notifications/custom-timestamps-on-notifications.md

@@ -32,10 +32,10 @@ This section provides design and implementation guidance for app notifications i
 
 ## Additional app notifications features
 
-- [Custom audio on app notifications](custom-audio-on-toasts.md)
+- [Custom audio on app notifications](custom-audio-on-notifications.md)
 - [App notification progress bar and data binding](notification-progress-bar.md)
 - [App notification with pending update](notification-pending-update.md)
-- [Custom timestamps on app notifications](custom-timestamps-on-toasts.md)
+- [Custom timestamps on app notifications](custom-timestamps-on-notifications.md)
 - [App notification collections](notification-collections.md)
 - [App notification headers](notification-headers.md)
 - [Notification listener: Access all notifications](notification-listener.md)

hub/apps/develop/notifications/app-notifications/custom-timestamps-on-toasts.md

@@ -467,13 +467,13 @@ items:
         - name: Additional features
           items:
           - name: Custom audio
-            href: notifications/app-notifications/custom-audio-on-toasts.md
+            href: notifications/app-notifications/custom-audio-on-notifications.md
           - name: Progress bar
             href: notifications/app-notifications/notification-progress-bar.md
           - name: Pending update
             href: notifications/app-notifications/notification-pending-update.md
           - name: Custom timestamps
-            href: notifications/app-notifications/custom-timestamps-on-toasts.md
+            href: notifications/app-notifications/custom-timestamps-on-notifications.md
           - name: Collections
             href: notifications/app-notifications/notification-collections.md
           - name: Headers