Way back in the beginning we all left ITunes for JR player. In the process some continue to use ITunes for ripping to AIFF and these files needed storage directive to a folder. External storage required "advanced" directive. It may just be me but I seem to remember the JR software went into ITunes folder and pulled files to its library. Every time you ripped in Tunes, subsequent files uploaded to JR library upon startup.
When recently changing computers, license transfer somehow lost its directive as simply auto importing does not follow. Import settings need re-addressed, it's not enough to show "user" and "music folder". A physical location must be inputted and this includes drive location outside of ITunes. Now with rip capability, MC stands on its own a complete player. I have not used the rip feature, I suspect doing so simplifies the directory.