...
A quick check that could be done on the Import Files Grid, to see if the Import File might have had an error, would be to check the "Record Count" and "Added Count". The "Record Count" indicated how many lines the File has that will be processed, while the "Added Count" indicates how many Records records were actually added successfully saved to the system.
Note: Imports like Calls and Usage, are expected to add so many records to the system that these types of Imports do not add details to the Imported Records Grid. These Imports have their own Details and Errors Grids under View/Report for Billing.
...