I cannot see the drive on my Windows 7 Network. I’ve rebooted the drive many times to no avail. I can see it on another Win 7 network and a Win 10 network. What gives?

You can refer the link mentioned below and enable the required services in order to resolve the issue.

You can also check the network discovery of your windows 7 PC and modify them as per the link mentioned below.

I would recommend you to check the link and go through the article and take the required steps given in the article: