That's easy. When you copy something you place it onto the clipboard, when you past it you are pulling a copy off the clipboard.
So "copy and paste" or "copy and glue". How does pasting go with copying? I copy something to the clipboard (...whatever) and then copy it from the clipboard to my document. How is that like gluing something? It really makes no sense.
And then I remember cutting. "Cut and paste" makes more sense. You might cut something out of a magazine and glue it onto a collage. Okay.
But the point is that none of this matters. "Paste" is a new word that means to copy something from your "clipboard" to the current location. It's not a metaphor anymore, it's a thing in its own right. A new definition for an old word.
What's the point in inventing a new term for something, when this one makes sense and is widely understood?