You issue an Imac Copy command and it automatically puts that one Copy on the clipboard. Everytime you paste without doing another Copy it uses that one copy from the clipboard.
It's not an "Imac Copy," just a copy on any and all Macs. And I like that I can repeat paste the item there, as that can be very handy sometimes when you have to enter the same data multiple times.
Why would you not use Text Edit and keep a list of all thing you like to Copy and Paste.
Who said I don't? I use clipboard to get items from that list to paste where I want them.
You can not access any of the data?
Yes, you can access ALL of the data. It is the last thing you copied and you can access it to paste anywhere.
I must be missing something?
Nope, that is how it works.
As an aside, back when I was using Windows, I hated, with a passion, how it stored multiple things I copied because it seemed to randomly decide what to paste. It was very frustrating, to the point where I quit using it. The macOS approach is much more useful as it is.
if you want multiple things in the copy area, go to the App Store and search for "clipboard" and pick what suits.