Update calculate-blob-count-size.md

Sometimes we observed that the cx is unable to calculate the size of the blob from the inventory report. When we verify the inventory rule configuration, we identify that the Content-Length is not included in the Custom Schema fields which caused this issue.

Author: DeeptiJainMicrosoft

articles/storage/blobs/calculate-blob-count-size.md

@@ -22,6 +22,9 @@ The first step in this method is to [enable inventory reports](blob-inventory.md
 
 When you have an inventory report to analyze, grant yourself read access to the container where the report CSV file resides by assigning yourself the **Storage Blob Data Reader** role. Be sure to use the email address of the account you're using to run the report. To learn how to assign an Azure role to a user with Azure role-based access control (Azure RBAC), follow the instructions provided in [Assign Azure roles using the Azure portal](../../role-based-access-control/role-assignments-portal.md).
 
+> [!NOTE]
+> To calculate the blob size from the inventory report, be sure to include **Content-Length** in the Custom Schema fields that has the actual size of the individual blob.
+
 ## Create an Azure Synapse workspace
 
 Next, [create an Azure Synapse workspace](../../synapse-analytics/get-started-create-workspace.md) where you will execute a SQL query to report the inventory results.