Ihave been using Lightroom on a Mac for years with my photos on an external drive. The drive is acting up and I have copied all my photos onto another drive. I have also copied the LRC catalog to the same drive. But I only see the photos from the original drive. How do I get Lightroom to see the other drive. Copying the catalog to the new drive and opening it in Lightroom worked. But I cannot see the files on the new drive in Lightroom. I'm missing a (some) step(s). Any help would be appreciated.