Switched macs Lightroom classic doesn't see all photos on external hard drive
My Macbook Pro has crashed. (insert scream here) Everything is on an external hard drive that I regularly back up. I switched to using my iMac, opened Creative Cloud, updated Lightroom Classic (have never used it on this computer), opened Lightroom Classic, and another scream!!! I see my hard drive, but only 2015 and 2016 files are there with the shadowed arrow beside the files inside. I can clearly see the rest of the files on the hard drive, but not in lightroom. I'm not a computer wiz, and I am not fluent in Lightroom. Someone help???
running macOS Catalina 10.15.1
Mac mini (Late 2012)
2.6 GHz Quad-Core Intel Core i7
16 GB 1600 MHz DDR3
Intel HD Graphics 4000 1536 MB
