Optimizing Data Collection for User Funnel Insights in Mixpanel

Hi guys, I’m trying to figure out how to correctly collect data that will allows us to create a funnel of anonymous users to signups, filtered by specific user segments. It seems like Mixpanel doesn't report the properties of users who haven't been identified, and those properties only become available when identify/alias is called (during signup/login). As a result, this misses a large portion of anonymous users who don't sign up and prevents an accurate assessment of the performance of different channels to determine which one converts better. I was trying to use mixpanel.register(), but that only adds properties to events and user filters don't work in this case Anyone knows of a proper way to deal with that? In contrast, Amplitude reports properties of all users and there is no such issues there but Mixpanel seem to work differently and I'm trying to figure out if I'm missing something. Thanks!