short answer
it
will import these files ... eventually.
there are too many variables to explain reasons why sometimes this is fast sometimes it could take overnight, but JRiver is designed to not continuously be looking for files to import. On slow networks/NASs this is a good thing. So either you have to somehow provoke a system event, or much easier and controllable ==> just run autoimport manually .. if a full import is too slow on your network, you can just import an individual folder as one of the options. You can even set-up a shortcut for this on the menu bar
PS - My for what its worth, 2-cent tip ... rip always to a temp directory which should be included in your auto import settings. Make an admin view to include only this directory .. verify your tags/artwork, and then use the copy/move tool (F6) to move them to your main media root -- you can make a preset for this, so it becomes really fast and controllable. Other ways to speed up importing -- get cover art and analyze the audio
after import, not at the same time. Setting up an admin view to control this is very easy