Assume that you are using Microsoft SQL Server 2012 Reporting Services (SSRS 2012) or SSRS 2014 in SharePoint integrated mode. After you create a file share subscription, the description field is not populated in the subscription list on ManageSubscriptions.aspx page accordingly.
Service pack information for SQL Server 2014
To resolve this issue, obtain Service Pack 1 for SQL Server 2014.
For more information about SQL Server 2014 Service Pack 1 (SP1), see bugs that are fixed in SQL Server 2014 Service Pack 1.
Service pack information for SQL Server 2012
To resolve this problem, obtain the latest service pack for Microsoft SQL Server 2012. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
2755533 How to obtain the latest service pack for SQL Server 2012
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.