Photos on external hard drive or visible in LR Classic on new Macbook
I'm likely being dumb Mac user noob. I have transferred my LR Classic catalogue to a new MacBook M2 (with latest Ventura update) from Windows PC. Photos are kept on a WD external hard drive. As you can see from the photo, there are about 122k photos on the hard drive but LR can only seemingly access about 840. They all appear as greyed out thumbnails with the usual exclamation mark within LR but I can't remind them. What do I need to resolve this. Thanks!

