Currently, each card and whiteboard has its own separate undo/redo history. This means actions aren't connected across cards and whiteboards yet.
For example, if you drag content from Card A to the whiteboard and then undo that action on the whiteboard, the newly created card will disappear. To fully revert to your original state, you'll need to undo again on Card A.
In short: When moving content between cards or between a card and the whiteboard, you'll need to perform undo actions in both places.
