Mike V on "How do I copy an image's title to caption"

Hi

I have lots of images with nice titles but no captions. On upload, I want to copy these titles into the caption. I tried using this solution (after swapping the 'title' for 'caption' because his solution does the opposite of what I want), but the 'caption' text ends up in the Description, not the Caption field.

Thanks in advance for your help.

Mike V.