Am I doing this wrong- do I need to hit ctrl or fn or alt or shift? Thanks for responses
Undo typings is currently not a supported action using the z shortcut. A list can be found here: https://help.trello.com/article/1230-undoing-an-action-in-trello
If you are looking to undo a text edit, check if the browser itself has an undo feature that might help in this case.
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