It was my hope that I could move my images to the hard drive and use them from there, opening up space on my Mac. I don’t see that scenario in the manual, though it seems it should work. I do have them backed up on my Time Machine on another drive, too.
The manual talks mostly about copying files to the new drive and how to retrieve them.
What I would like to do is partition the drive, using half for overflow Time Machine backups. The other half, I would like to move all of my photo images to the drive, deleting them from my Mac. I would like to access them from the WD drive and save them to that drive.