How do I undo/redo an annotation?
The undo and redo buttons allow you to undo or redo an action on your document.
Undo
From the toolbar, select the left-pointing arrow  to undo your last action. Press multiple times if needed to undo multiple actions.
 to undo your last action. Press multiple times if needed to undo multiple actions.

Redo
From the toolbar, select the right-pointing arrow  to redo your last action. Press multiple times if needed to redo multiple actions.
 to redo your last action. Press multiple times if needed to redo multiple actions.

Tip: You can also use a keyboard shortcut to undo an action
| Undo   
 | Mac: Command+Z Windows: Ctrl+Z | 
