fix(Flutter): Added required flags to sandbox command when using Flutter (#7660)

* Added required flags for sandbox command when using Flutter

* Update src/pages/[platform]/start/quickstart/index.mdx

* Apply suggestions from code review

Updated the platform filters.

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

---------

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

Author: naedx

src/pages/[platform]/build-a-backend/auth/set-up-auth/index.mdx

@@ -69,9 +69,15 @@ npx ampx sandbox
 <InlineFilter filters={['flutter']}>
 
 ```bash title="Terminal" showLineNumbers={false}
-npx ampx sandbox --config-format dart --config-out-dir lib
+npx ampx sandbox --outputs-format dart --outputs-out-dir lib --outputs-version 0
 ```
 
+<Callout info>
+
+**Note:** when using Amplify Gen 2 with Flutter, you must downgrade the generated client configuration file (`amplify_outputs.dart`) with [`--outputs-version 0`](/[platform]/reference/cli-commands/#npx-ampx-generate-outputs)
+
+</Callout>
+
 </InlineFilter>
 <InlineFilter filters={['android']}>
 
@@ -382,12 +388,6 @@ flutter pub get
 
 Next, update your `main.dart` file with the following:
 
-<Callout info>
-
-**Note:** when using Amplify Gen 2 with Flutter, you must downgrade the generated client configuration file (`amplify_outputs.dart`) with [`--outputs-version 0`](/[platform]/reference/cli-commands/#npx-ampx-generate-outputs)
-
-</Callout>
-
 ```dart
 import 'package:amplify_auth_cognito/amplify_auth_cognito.dart';
 import 'package:amplify_authenticator/amplify_authenticator.dart';

src/pages/[platform]/start/quickstart/index.mdx

@@ -1296,10 +1296,24 @@ Running this command will scaffold Amplify backend files in your current project
 To deploy your backend use Amplify's per-developer cloud sandbox. This feature provides a separate backend environment for every developer on a team, ideal for local development and testing. To run your application with a sandbox environment, you can run the following command:
 
 
+<InlineFilter filters={["android", "javascript", "react-native", "angular", "nextjs", "react", "react-native", "vue", "swift"]}>
 ```bash title="Terminal" showLineNumbers={false}
-npx ampx sandbox --outputs-format dart --outputs-out-dir lib
+npx ampx sandbox
+
+```
+</InlineFilter>
+<InlineFilter filters={["flutter"]}>
+```bash title="Terminal" showLineNumbers={false}
+npx ampx sandbox --outputs-format dart --outputs-out-dir lib --outputs-version 0
 ```
 
+<Callout info>
+
+**Note:** when using Amplify Gen 2 with Flutter, you must downgrade the generated client configuration file (`amplify_outputs.dart`) with [`--outputs-version 0`](/[platform]/reference/cli-commands/#npx-ampx-generate-outputs)
+
+</Callout>
+</InlineFilter>
+
 ## Adding Authentication
 
 The initial scaffolding already has a pre-configured auth backend defined in the `amplify/auth/resource`.ts file. We've configured it to support email and password login but you can extend it to support a variety of login mechanisms, including Google, Amazon, Sign In With Apple, and Facebook.