Does each package in a shipment get its own shipping label, or is there one shipping label per shipment?
Each package has a different label, which means that there can be multiple shipping labels per shipment.
What happens when I select Pack All?
Selecting Pack All assigns all remaining items to the selected package.
How can I redo Smart Pack after selecting Undo Smart Pack?
If you accidentally select Undo Smart Pack, you can select Smart Pack to return the fulfillment items to their suggested packages.