I'd like to report a bug. Using arcGISPro's "Add Data" or "Add a Folder", I cannot see a network location that is connected to my computer. Note: this network location, no a network drive, so it does not have a path letter.
As shown in the attached image (Left: Add Folder Connection. Right: Windows Explorer), I can see my C Drive, and a mapped network drive (H), but not the network location. Even though it isn't listed. I can paste the fully qualified path into the address bar of the Add Folder Connection window, to access data.