fix(obj): Add info on gpsup

Author: SamyOubouaziz

pages/object-storage/api-cli/setting-cors-rules.mdx

@@ -110,6 +110,10 @@ aws s3api delete-bucket-cors --bucket BUCKETNAME
 
 ## Troubleshooting
 
-If you encounter errors while using CORS rules with Scaleway Object Storage, make sure you have properly configured the [AWS CLI](/object-storage/api-cli/object-storage-aws-cli/) using your Scaleway credentials.
+If you encounter errors while using CORS rules with Scaleway Object Storage, make sure:
+
+- You have properly configured the [AWS CLI](/object-storage/api-cli/object-storage-aws-cli/) using your Scaleway credentials.
+
+- You have the `ObjectStorageBucketsWrite` or `ObjectStorageFullAccess` [IAM permissions](/iam/how-to/view-permission-sets/).
 
 Refer to the [dedicated troubleshooting pages](/object-storage/troubleshooting/) to get more help with Scaleway Object Storage.