CORE on iMac Pro. WD SSD drive format exFat plugged into same computer using lightning port. Drive shows up on desktop and is usable. Shows up in Roon storage folder set up but has this message: Error loading folder, unauthorized, so you cant set up as 2nd folder of music. 1st folder of my music is on the iMac pro hard drive under users/stj/RoonMusic, a folder I set up originally. Other hard drives connected by USB ports have the same message.