Please make sure the CSV file meets the requirements.
After you’ve done that, that a moment to read the tips. If the requirements and tips are followed there should not be an issue importing the file.
Also, please refer to the second paragraph in this FAQ as I think it is the reason you are not seeing items being imported:
One last suggestion if none of this works… If you have not upgraded Connections to version 8.11, please do so now. After the upgrade is complete navigate to the Connections : Settings tab and click the Betas tab. Opt into the CSV Import beta. Then navigate to the WordPress Updates admin page and click the Check Again button. Update to the beta version of CSV Import. It provides faster importing of large CSV files and more importantly more feedback during the import process. If CSV rows are skipped or failed it let you know and provide download links to CSV file which contain the skipped and failed rows.
Hope this helps! Let me know.