A message appears stating that the data import is in
process and once it is complete, the email id users receives a mail with the
log file.
If the import succeeds, the mail says that the import is
successful and you can check the log for the information. If the import fails,
the mail says that the import has failed and you can check the log for details,
correct the errors, and import it again.
If import is partially failed, the mail says that the import is
successful with few failures. You can refer the attached excel in the mail for
the failed data. You have to correct the data, rename the sheet names as per
the admin xml, and import it again. Each excel sheet contains an extra column
for errors for each row.