In Photoshop the Command (Apple) key + Z will Undo your last action using the Option (Alt) key with Command + Z will repeatedly Undo your previous actions - effectively scrolling back up through the History palette.
Try Ctrl + Y. There is no common universal shortcut for Redo, although you might find the option in some programs, e.g., Adobe Photoshop.
There are many different ways to Undo in Photoshop. Ctrl + Z is keyboard shortcut for Undo last operation, Ctrl + Alt + Z is Undo keyboard shortcut. You can Undo and from Edit > Undo or from HISTORY panel (Window > History).
ctrl+Z to undo , if you selected more than one thing ctrl+shift+Z can go back further steps if you where doing something more advanced also that can be used in anything you can do to undo in photoshop.
Ctrl + Z
ctrl + a : select all
The re-do shortcut key varies depending on the application or program you are using. In most programs, the shortcut key for redoing an action is typically "Ctrl + Y" or "Ctrl + Shift + Z". You can also usually find the redo option in the Edit menu of the program.
Ctl Z does nothing (neither does command Z or Option/alt Z). In my prefs I have it set to undo up to 64 steps. I have restarted Blender, nothing. Neither the shortcut or the menu Undo command works. Google doesn't turn up anything.
apple
ena
The Undo is done by pressing Ctrl - Z.
yes
Ctrl + Z is Undo and Redo (last step only), Alt + Ctrl + Z is step backward and Shift + Ctrl + Z is step forward.