I Am using Seagate (a) 1Tb external hard drive as my photo storage for my Macbook pro, which has 250 SSD , once the drive (a) got full, I started storing all my photos in another external Seagate (b) 1TB, but when I want to use or edit from previous Seagate (a), I Am unable to see my photos in my library module, I can only see my photos If I click on import photos, then only it will show on my Seagate (b) drive why is my lightroom 6 not showing photos? It shows the photos are missing with this sign !!!, saying would you like to locate lost pictures??
Sounds like you moved your images to the external drive outside of LR using your OS tools. (This is not necessarily a bad thing.)
Now you just need to tell LR where you moved the images to, using the LR Folders panel.
Thank you Joe.
Sent from my iPhone