'Undo' button won't show up

[rotem adler]

Hey guys, hope you're all doing well !

For some reason the 'Undo' button won't show up on my Stamper. Any idea why this might happen ?

[Bryan]

This is because we went with the standard Unity undo system which is CTRL + Z.
The Record Undo is simply to record anytime you undo into the session. 
 

[kr4k3n]

Interesting... [CTRL + Z] didn't work after I used the stamper, now I can't get my terrain back since there isn't a [record undo]. Trying to contain my frustration,

[Bryan]

What does the session manager say? 
Do you have any recordings in there? 

Undo is a Unity System, we do not control that at all.