20 Nov 2018, 06:11

I may be to late, but there is a redo in photoshop. Unless you where deleting straight from your history window. Not sure how that works. I know with the latest update they seem to changed the way the undo works. Before I think it only allowed you to undo 2 or 3 steps. But know you can do a lot more. I believe the setting is under preferences > performance.

I have come to learn, save often. I sometimes save it as a different file name. That way I can always go back to an earlier version. If you are on windows you might be able to right click and restore the file from a previous version.