add to TOC and placeholder text

mongodb · Jan 21, 2025 · 660c9a5 · 660c9a5
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diff --git a/source/sync/device-sync-deprecation.txt b/source/sync/device-sync-deprecation.txt
@@ -7,11 +7,11 @@
 Device Sync Deprecation
 =======================
 
-.. contents:: On this page
-   :local:
-   :backlinks: none
-   :depth: 2
-   :class: singlecol
+.. toctree::
+   :titlesonly:
+   :hidden:
+
+   Migrate to AWS AppSync </migration/awsappsync>
 
 As of September 2024, Device Sync is deprecated for Atlas App Services. Device
 Sync will reach end-of-life and be removed on **September 30, 2025**. If you

diff --git a/source/sync/migration/awsappsync.txt b/source/sync/migration/awsappsync.txt
@@ -72,3 +72,39 @@ The following diagram shows a typical example of the new architecture:
 .. image:: /images/migration/aws_appsync_architecture.png
    :alt: A diagram showing a typical Device Sync architecture.
 
+Migration Steps
+---------------
+
+MongoDB Atlas
+~~~~~~~~~~~~~
+
+If needed, update the database security and network access.
+Create a Database Trigger that fires an EventBridge event. 
+
+AWS 
+~~~
+
+EventBridge
+```````````
+- Configure Atlas as the partner source.
+- Configure AWS AppSync as the target.
+- Create a mapping of the event body’s fields to AppSync’s GraphQL endpoints
+- Configure security
+
+AWS Lambda Resolver
+```````````````````
+- Create Lambda functions with the MongoDB Data APIs or MongoDB drivers
+
+AWS AppSync
+```````````
+- Set up security
+- Link to the Lambda Resolver
+
+Application Code
+~~~~~~~~~~~~~~~~
+
+- Replace the Realm SDKs with the MongoDB driver to read and write to Atlas.
+- Add drivers to write and read from the device’s datastore (the default is 
+  SQLite in both iOS and Android environments.) 
+- What’s the advantage of using AWS Amplify here?
+