got a new iMac pro, first Mac in 10 years so am moving along slowly. I purchased a external 1tb ssd and plugged it in. Created a Pictures album and transferred about 9,000 pictures from my pc to this drive by using a usb and copying/pasting. Now that they are all there I also created a Document folder and did same. Also using drive as backup. My problem is I’ve googled changing so when I click on the photo icon it would go to the external ssd. This is last directions I’ve used. All were similar. http://www.idownloadblog.com/2016/02/08/how-to-move-photos-library-to-external-drive/ What am I missing.