Question / Problem:
How does it work when uploading master data on buyer level using Online Connect?
Answer / Solution:
Online Connect will create buyer folders after clicking through the configuration wizard.
Except if the customer account is in a customer group and you are using a partner level user in the Online Connect credentials. Online connect can only "see" 2 levels down. Like customer -> buyer, or customer group -> customer. If the case is customer group -> customer -> buyer, that would be 3 levels, so in that case the buyer folders must be created manually.