Add custom stack example

Author: Amplifiyer

src/pages/[platform]/build-a-backend/troubleshooting/circular-dependency/index.mdx

@@ -48,9 +48,18 @@ export const preSignUpTrigger = defineFunction({
   resourceGroupName: 'auth',
 });
 ```
-
 If you are unable to resolve this error using function's `resourceGroupName` property, please create an issue [here](https://github.com/aws-amplify/amplify-backend/issues/new/choose)
 
+### Circular dependency error with with a custom stack
+
+If you are creating cdk resources and assigning them to a CustomStack, you might also run into this issue. Your error message would look like "The CloudFormation deployment failed due to circular dependency found between nested stacks [storage1234ABCD, auth5678XYZ, **MYCustomStack0123AB**]
+
+To resolve this, try creating your resources in the same stack as the resources you are trying to interact with. For example, if a custom resource such as `sqs` needs to interact with the s3 resource created by `defineStorage`, you can create that `sqs` resource in the stack created by Amplify. You can reference the existing Amplify created stack like
+
+```ts title="backend.ts"
+const queue = new sqs.Queue(backend.storage.stack, 'MyCustomQueue');
+```
+
 ## Circular dependency error between resources in the same stack
 
 If you see this error "The CloudFormation deployment failed due to circular dependency found between resources [resource1, resource2] in a single stack", that means the resources themselves have a circular dependency in the same stack. For handling such errors, see https://aws.amazon.com/blogs/infrastructure-and-automation/handling-circular-dependency-errors-in-aws-cloudformation/