Windows 7 Pro and Windows 10

I have 2 Windows 7 pro computers, one is acting like a file server and one is a client connected to the server. I got a windows 10 pro laptop and made into a file server and map it so everyone can access it (read and write) on the same network. However, the Windows 7 computers are not showing up the Windows 10 computer. My end goal is for both Windows 7 computers communicate with the Windows 10, please assist, thanks in advance !