R7000P Cannot Create Network Shares

Greetings:

I have an R7000P running firmware V1.3.2.124_10.1.64, which is the latest. I manage this router with a Lenovo Y700 laptop running Windows 10 64-bit. I have two ReadyShare drive shares which are connected to a USB Seagate drive connected to the front of the router. It has been connected like this since I bought it three years ago. I had a third share on the router going to this same drive and wanted to add a fourth today. I connect to the router via Firefox. While on the Advanced tab and the USB Functions option, ReadyShare Storage option, when I attempt to select either button Edit or Create Network Folder, the display stays the same. It does not give me the option to edit existing shares or to create a new one. Has anyone run into this issue before? If so, I'd appreciate your help in getting this resolved. Thank you.