After you submit the files to be imported, step 2 shows a Validations column.
Validation definitions
Validation
Definition
Ready for import
The file has all necessary information to be imported.
Valid. Reputation already set
The file is valid for import and has a reputation already set.
Warning: Enterprise count > 0
The file has at least one reputation already set.
Important
If the file has at least one valid hash value, it is imported. However, if there is a hash value but it is invalid or malformed, the import is not completed.