Ctrl+Z does 'undo' only for the last performed action in Adobe Photoshop 7.0. How to undo an 'erase' action done a while ago,I mean,an erase done before a few other actions to edit the photo?
You can look for the history.. or for simpler action.. The undo for PS is Ctrl + Alt + Z
Read about Using the History panel
at this link: https://helpx.adobe.com/photoshop/using/undo-history.html
i suggest you to step backward instead of undo :
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