I have a referenced library of scanned travel images on an external drive that has now almost filled.  How do I move this library to a new much larger external drive?  I have experimented with one folder of photos by just dragging and dropping (it was actually copied).  I then disconnected the original smaller drive and attempted to look at the images on the new drive.  The images and metadata were there but when I went to the adjustments the ‘image offline’ message came  up.  I went into File> Relocate Originals but got the message that ‘unavailable original files cannot be relocated’.   What should I be doing?