It’s unlikely to work, my CXN had a HDD attached for a while , it was visible only through the CA app.
Why don’t you just plug it into the Acer notebook and set it as a watched folder in Roon
The USB drive route is pretty clunky anyway all you see is the folder structure of the drive so any navigation is based on that. It works but it’s not ideal. It was really there just to play the odd tune off a stick
As others have mentioned, this will only work if the CXN supports SMB (Samba). I would reach out to Cambridge to see if this device can support the SMB share and if it does, you’ll then be able to add it to Roon using our Add Folders By Path Guide.