trying to upgrade from version 3.
Uninstall the 1Password 3 extension
If you still have the 1Password 3 extension installed, uninstall the 1Password 3 extension.
Don’t skip the steps in the other support article. They must be completed to verify that Logins in the extension are showing up in the 1Password 3 app. If you skip the steps above, you could lose some or all of your data!
I don't know what "Don't skip the steps in the other support article" refers to.
1Password Version: 3.8.21
Extension Version: no extension
OS Version: 10.14
Sync Type: cloud
Referrer: forum-search:need help upgrading from version 3