Does the import support a report that has summaries?

The Import Wizard requires a Salesforce report that does not contain any summary rows. This is because summary rows introduce additional data that causes the import process to fail. Specifically, these rows are interpreted as extra records, which are rejected during the import. To avoid errors, ensure that your report contains only raw data. If your report includes summarised data—such as total or average values at the end—please remove those rows before running the import.