Again: Is It Possible to Watch A Network Folder?

I've found a lot of discussions on this topic in the forums, but no conclusive answer, nor any documentation from Adobe themselves.

I've migrated a major part of my photo library (the part I share with my family) to a NAS. I've done the initial import into Photoshop Elements 2018 Organizer. But now I would like to see Organizer alert me that new photos have been found whenever I launch the application. It does so with My Pictures, I even had to teach it not to bother with OneDrive... but whenever I try to add the NAS folder with our shared photos as a Watch Folder, nothing happens at all.

As far as I can tell, previous versions of PSE gave various errors when one tried to add a network folder as Watch Folder. Then again, previous versions implemented the Watch function as a service, and that doesn't seem to be the case any longer. And the fact that adding a network folder leads to nothing at all (no message of any kind, it just isn't added) doesn't tell me anything.

Is there a way to add a network folder as Watch Folder?

And if not, is there Adobe documentation explicitly telling us that it's not possible?

(Of course, the workaround is to re-import the network folder whenever I feel necessary, but that's an additional action and a repeated indexation of all 15,000 photos just to find the few that are new. A waste of time and clicks.)