Unable to export usd file to local Nucleus server

Hey Simplychenable,
thanks for your efforts to help clearing this up.
There is definitely something weird going on. The folder inside the Windows/Documents directory seems to be created by the connector HDA, not by Nucleus. After a fresh install of Nucleus and all folders deleted, the folder appears the moment I run Houdini with the connector installed.
I’ve attached a screenshot, showing the folders in Documents and the folder in localhost.
Note that the contents are the same except for the subfolders /Test and /backup.
I understand that Nucleus installs it’s own filesystem accessible only through the Nucleus browser. Is that correct? I was searching for the physical location on my drive for the files I saved to the localhost path from inside Houdini, that’s how I stumbled over the folder in documents.
This all seems very convoluted to me. It may connect to the other problem I described in this thread:

I just tried to save a fresh scene using the ov save hip button. and it shows up in the Nucleus browser and the windows/documents/Omniverse folder. So the two are definitely connected.
Is this perhaps why the ROP has trouble creating folders during export?