...
The metadata will be loaded into the domain object, but will for the most part be hidden from the UI. The We have chosen not to strip any of the metadata in attempt to be able to round trip as close to the original file and the UI will determine how the data is displayed.
...
When the res.csv doesn't contain all the required metadata (such as, importing a csv than exporting as a res.csv) it will appear to flatten the data.
Reading into Data Sources
...
The name chosen for display will be "Site > Structure" if the metadata exists, otherwise the "Name" Field will be used. However, as names need to be unique, we will append the Field metadata to this name for any non unique columns
...