I have accessed DataStore2 with the editor before, using this method:
More info here:
I was under the impression that DS2 saves on .PlayerRemoving, so I’m unsure of why you lost data. Kampfkarren also mentioned that it works on migrating to latest version, so something else is most likely is in play here.
Question Answered here:
Extra tips: When on Mega-Threads like the DS2 one, CMD-F or CTRL-F to search for applicable terms like Migrate to Latest Update or DataStore Editor. If you do not find applicable topics through the devforum search bar, you can always use google.
Finally, while I have seen these posts before and knew where they were, a few extra minutes of searching won’t hurt either. Hope this helps!