Turns out it was a Word doc. They wanted to have the file open on both machines and see the changes on both as they saved on the one PC. That's not how it works today.
If you are watching a folder with Windows Explorer it may not refresh so you know to tap F5 just like a browser to refresh the view.
This is not a bug. It's how it works.
I have setup a homegroup on my desktop (windows 10). I sign in to the homegroup on my laptop (windows 7). I can open my shared file and thought everything was fine until I made changes to the file on the desktop and the changes did not show on the laptop. Is there something I can do to see the file changes (hopefully real time)
Thanks for any assistance.