I get it but doesn’t quite work, works 1/3 of the time with the middle click, I have to press middle click like 10 times to actually paste. I wish that it could be with 1 left-click from the “meta + v” summoned widget.
the main clipboard one is filled by the copy or Ctrl-C command
you can paste from 1 using the paste or Ctrl-V command
the quick paste one is filled whenever you highlight text with your cursor
you can paste from 2 using the middle mouse button
the clipboard (system tray or Meta+V) shows your clipboard history with the main paste buffer contents shown at the top of the list.
choosing a different item from the history will move the chosen item into the buffer and move the old item back down into the list… it also seems to displace whatever was in the quick paste buffer, so that content is lost, which is something to keep in mind.
regardless, you still need to use the paste or Ctrl-V command, or use the middle click, if you want to actually paste anything from either of these buffers.