Hi, I’m trying to create a data table that shows the breakdown of 4 different segments in a cohort of 1,000 users. I’m grouping it by `initial_utm_medium`, but the first event (SMS sent) is returning (None) for all users, regardless of whether they later visited the site and got assigned a utm_medium or not.
Is it possible to group by something that was set later in the user journey? It would be helpful to be able to filter in this way.