Update accounts.md

Note explicit caveats about storage accounts and application packages.

Author: alfpark

articles/batch/accounts.md

@@ -30,6 +30,9 @@ Batch supports the following types of Azure Storage accounts:
 - General-purpose v1 (GPv1) accounts
 - Blob storage accounts (currently supported for pools in the Virtual Machine configuration)
 
+> [!IMPORTANT]
+> You can't use the [Application Packages](batch-application-packages.md) feature with Azure Storage accounts configured with [firewall rules](../storage/common/storage-network-security.md), or with **Hierarchical namespace** set to **Enabled**.
+
 For more information about storage accounts, see [Azure storage account overview](../storage/common/storage-account-overview.md).
 
 You can associate a storage account with your Batch account when you create the Batch account, or later. Consider your cost and performance requirements when choosing a storage account. For example, the GPv2 and blob storage account options support greater [capacity and scalability limits](https://azure.microsoft.com/blog/announcing-larger-higher-scale-storage-accounts/) compared with GPv1. (Contact Azure Support to request an increase in a storage limit.) These account options can improve the performance of Batch solutions that contain a large number of parallel tasks that read from or write to the storage account.