Where are my autosave files?

I have Adobe Acrobat Pro DC and it just crashed. When I reopen the software, it opens all the files from last session. However, all the editings I made were gone. I checked the preference and autosave was enabled at every 5 minutes. But "open autosaved file" was not prompt and I don't see any autosave folder in appdata folder. Please help! Thank you!