Merge pull request #270425 from aahill/web-app-update

updating web app section

Author: American-Dipper

articles/ai-services/openai/how-to/use-web-app.md

@@ -7,7 +7,7 @@ ms.service: azure-ai-openai
 ms.topic: how-to
 author: aahill
 ms.author: aahi
-ms.date: 02/23/2024
+ms.date: 03/27/2024
 recommendations: false
 ---
 
@@ -45,13 +45,32 @@ When customizing the app, we recommend:
 
 Sample source code for the web app is available on [GitHub](https://github.com/microsoft/sample-app-aoai-chatGPT). Source code is provided "as is" and as a sample only. Customers are responsible for all customization and implementation of their web apps. 
 
-### Updating the web app
-
-We recommend pulling changes from the `main` branch for the web app's source code frequently to ensure you have the latest bug fixes, API version, and improvements.
+## Updating the web app
 
 > [!NOTE]
 > After February 1, 2024, the web app requires the app startup command to be set to `python3 -m gunicorn app:app`. When updating an app that was published prior to February 1, 2024, you need to manually add the startup command from the **App Service Configuration** page.
 
+We recommend pulling changes from the `main` branch for the web app's source code frequently to ensure you have the latest bug fixes, API version, and improvements. Additionally, the web app must be synchronized every time the API version being used is [retired](../api-version-deprecation.md#retiring-soon). 
+
+**If you haven't customized the app:**
+* You can follow the synchronization steps below
+
+**If you've customized or changed the app's source code:**
+* You will need to update your app's source code manually and redeploy it.
+    * If your app is hosted on GitHub, push your code changes to your repo, and use the synchronization steps below.
+    * If you're redeploying the app manually (for example Azure CLI), follow the steps for your deployment strategy.
+
+
+### Synchronize the web app
+
+1. If you've customized your app, update the app's source code.
+1. Navigate to your web app in the [Azure portal](https://portal.azure.com/).
+1. Select **Deployment center** in the navigation menu, under **Deployment**.
+1. Select **Sync** at the top of the screen, and confirm that the app will be redeployed. 
+
+    :::image type="content" source="../media/use-your-data/sync-app.png" alt-text="A screenshot of web app synchronization button on the Azure portal." lightbox="../media/use-your-data/sync-app.png":::
+
+
 ## Chat history
 
 You can enable chat history for your users of the web app. When you enable the feature, your users will have access to their individual previous queries and responses.