There is issues with export/import of custom master objects in CSV / Excel.
When we import we get an error message but no file displays.
We don't get any end user notifications either. Or when we click on Download, nothing happens
Release : 16.1.1
This is DE69384, resolved in 16.1.2
Note that as a prerequisite, BG Service must be started in order the notifications to be sent and the Downloads to be available.