docs: added cloud s3 documentation (medusajs#12762)

* docs: added cloud s3 documentation

* fixes

Author: shahednasser

www/apps/cloud/app/redis/page.mdx

@@ -33,6 +33,10 @@ If you're using a Medusa version before v2.7.0, [contact support](#) for assista
 
 </Note>
 
+### Access Redis Configurations
+
+Since Cloud is a managed service, you can't directly access your Redis instance or its configurations. Cloud also doesn't expose the Redis instance connection or configuration details.
+
 ### Override Redis Configurations
 
 If you need to customize the Redis configurations for any of the Redis modules and providers, you must host and manage your own Redis instance externally.

www/apps/cloud/app/s3/page.mdx

@@ -0,0 +1,47 @@
+export const metadata = {
+  title: `S3 Storage`,
+}
+
+# {metadata.title}
+
+In this guide, you'll learn about the managed S3 storage service that Cloud provides as part of your project environments.
+
+## Managed S3 Storage Service
+
+Cloud offers a managed S3 storage service for your project environments. Each environment has its own dedicated S3 bucket that is automatically provisioned when the environment is created.
+
+So, when you create a new project, Cloud creates a production S3 bucket for the production environment. If you create a staging environment, Cloud creates a separate S3 bucket for that environment as well.
+
+By default, the S3 bucket is private, but the files you upload to the bucket are publicly accessible. This is necessary for serving product images and other assets in your Medusa application.
+
+![Diagram showcasing S3 isolation between environments](https://res.cloudinary.com/dza7lstvk/image/upload/v1750230909/Cloud/s3-cloud_smrtfc.jpg)
+
+---
+
+## Configured S3 File Module Provider
+
+Cloud automatically configures your Medusa application to use the [S3 File Module Provider](!resources!/infrastructure-modules/file/s3).
+
+So, you don't need to configure the S3 File Module Provider or set up S3 manually. Also, if you have the S3 File Module Provider configured in `medusa-config.ts`, remove it to avoid conflicts.
+
+<Note>
+
+If you're using a Medusa version before v2.7.0, [contact support](#) for assistance in configuring the S3 File Module Provider.
+
+</Note>
+
+### Access S3 Configurations
+
+Since Cloud is a managed service, you can't directly access your S3 bucket or its configurations. Cloud also doesn't expose the S3 bucket connection or configuration details.
+
+### Override S3 Configurations
+
+If you need to override the default S3 configurations, such as changing public access to assets, you can do so by setting up and managing your own S3 bucket externally.
+
+Then, configure the S3 File Module Provider in your `medusa-config.ts` file to connect to your external S3 instance. Refer to the [S3 File Module Provider documentation](!resources!/infrastructure-modules/file/s3) for more details on how to configure it.
+
+<Note title="Tip">
+
+To set the connection options of your external S3 instance, refer to the [Environments](../environments/page.mdx#add-environment-variables) guide to learn how to add environment variables. You can then use these variables in your `medusa-config.ts` file to connect to your S3 instance.
+
+</Note>

www/apps/cloud/generated/edit-dates.mjs

@@ -7,5 +7,6 @@ export const generatedEditDates = {
   "app/organizations/page.mdx": "2025-06-17T10:48:50.969Z",
   "app/notifications/page.mdx": "2025-06-17T12:29:18.819Z",
   "app/database/page.mdx": "2025-06-17T14:34:57.104Z",
-  "app/redis/page.mdx": "2025-06-18T06:50:30.705Z"
+  "app/redis/page.mdx": "2025-06-18T06:50:30.705Z",
+  "app/s3/page.mdx": "2025-06-18T07:16:14.453Z"
 }

www/apps/cloud/generated/sidebar.mjs

@@ -77,6 +77,14 @@ export const generatedSidebars = [
             "title": "Redis",
             "path": "/redis",
             "children": []
+          },
+          {
+            "loaded": true,
+            "isPathHref": true,
+            "type": "link",
+            "title": "S3",
+            "path": "/s3",
+            "children": []
           }
         ]
       },

www/apps/cloud/sidebar.mjs

@@ -54,6 +54,11 @@ export const sidebar = [
             title: "Redis",
             path: "/redis",
           },
+          {
+            type: "link",
+            title: "S3",
+            path: "/s3",
+          },
         ],
       },
       {