In another question, someone mentioned that associations are not automatic but I think they are: having Customers - Orders (1-*). In the dataView (sourced from Customers), there is grid inside sourced by association Customers_Orders. When I do changes in the orders, I believe (and it seems like) that Orders are automatically associated with the user doing the changes. Am I right or this is some kind of coincidence and I have to manually save records for users by their ID?
The answer is it depends. If in the form the orders are shown over the reference then the new button will create the reference. Otherwise you have to create the microflow yourself to set the reference.
If enabled the user who creates an order is stored as an attribute, the same goes for the user who last changed a record.
What are you trying to achieve?