Update pages/generative-apis/how-to/use-batch-processing.mdx

Co-authored-by: fpagny <franckpagny@hotmail.fr>

Author: bene2k1

pages/generative-apis/how-to/use-batch-processing.mdx

@@ -24,7 +24,7 @@ Batch processing is designed for:
 - [Owner](/iam/concepts/#owner) status or [IAM permissions](/iam/concepts/#permission) allowing you to perform actions in the intended Organization
 - A valid [API key](/iam/how-to/create-api-keys/) for API authentication
 - Python 3.7+ installed on your system
-- The following IAM permissions: `s3:GetObject`,`s3:PutObject`
+- If bucket policies exists in the bucket storing your `.jsonl` file, the following bucket policies actions `s3:GetObject` and `s3:PutObject` for `scw-managed-genapi-batch` IAM application. This application is auto-generated by Scaleway after your first batch creation.
 
 ## How batch processing works