Make sure that you have all the photo folders in side one folder. Right click on a top level folder in Lightroom and choose Show Parent folder.
Do this until you have only 1 top level folder with all the others in it. Hopefully it'll be My Pictures or something like that. Copy this to your 4TB drive. Now in Lightroom right click on the top level folder and choose 'Update Folder Location'. Go to the copy you made on the new drive and select that. Lightroom now uses the files on the 4 TB drive.
Would make a good tutorial video.
Thanks you for responding so quickly.
When able, I will follow those instructions to see if I correctly interpreted it.
If able to do this first, when I then have cloned the 2TB drive to the 512GB drive, I should be able to reproduce the same folder update from the external 4TB drive to the now 2TB, data drive. Correct? It seems the key to keeping everything in order is to do it all from Lightroom. So, no loss of metadata, etc?
As long as you have everything in one folder in Lightroom, you can copy outside Lightroom and reconnect using Update Folder Location.
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That's great. When I finally do this, I will let you know.
Is there anything we need to do with Photoshop CC 2018 regarding moving our photos to a new hard drive? As we have to with Lightroom Classic CC
Nothing. It works from wherever the photos are.