THUMBNAIL PREVIEW WILL NOT SHOW UP ON MY .CR2 FILES

Hi guys, I have tried everything I know, but for some reason once I updated my OS to Catalina, all of my finder windows will no longer show the "Icon Preview" which I have made sure is checked off in "View" options for all windows. I have updated Camera RAW plugin and have no idea what would be causing this. Please anyone who can help me as I can't sort through thousands of images without seeing where I am.