What is the correct way to update customer attributes for already uploaded CRM IDs? For example when customer changes age group or segment.
Case in point: I have uploaded a test customer with attribute "Age" as 29. I have previously logged in as this customer, and I see visits where Age=29 in Analytics. So far so good.
I then upload a new file with the same customer included, but Age is now 30. I then log in as this customer (after the file has been succesfully ingested). I wait for the data to show up in Analytics, but Age for this customer still shows 29. If I use "Preview Data" under customer attributes, it also still shows 29 for this customer.