I create a profile schema containing some attributes that are updated with new values using an external process. What I want to do is have the updates in a file (e.g. JSON) with the userID and the columns to update. When I tried this simple approach, the new data does load, but the rest of the profile attributes are no longer there. I was doing this using the Datasets UI to load more data. What is the best way to update profile data from the UI? API is ok as well, it is just harder to demonstrat...