I use Adobe Photoshop CC. Need to know if there is any way to return to the previous status of a file . I've merged the layers , I inadvertently saved and closed , which means losing the whole process. I only saved once over .
It would be very important for me to return to the immediately previous version.
Once you closed the file, those layers are gone. If you are on a Mac with Time Machine active, you may be in luck. A long shot, but worth a look.
If by any chance it's Windows 7 or 8, previous versions are kept in Shadow Copy, and may be retrieved by Shadow Explorer.
Windows also has File History, but like Time Machine, that has to be turned on.
(might as well get that in, before I leave.)