All that data is lost when you migrate accounts though. I went from an old to a new 1P account and did the official way to copy (NOT exporting it to a text file and re-importing that way, actually copying it from the interface) and no version history persisted :/

I am using the latest version of their iOS app and only see my current version except for passwords.

Huh, yeah, I’m not seeing it there either. The macOS app is what I checked previously. iOS-only users might be able to see it at 1password.com. Weird inconsistency.