Clipboard and Placements
Clipboard
A selection can be copied to the clipboard using Ctrl+C.
With blocks in your clipboard, you can paste back into the world by hovering over the desired location using your cursor position and pressing Ctrl+V. Pasting like this will initiate a Placement.
The clipboard can be cleared by right-clicking the icon and choosing the 'clear' option.
Rotation and Scaling
While the placement is initiated and the Gizmo is visible, some options will appear on your View window1.
Tip: Left-clicking the 'Empty' clipboard icon opens up the Blueprint Browser.
Tip: You can set the Cut function save to the clipboard in the Keybinds Menu.
Notes
1
For versions 3.0.0 and below, the options will appear inside the clipboard window.