Test Case Importer, is not showing an error message when importing an attachment with authentication

Test Case Importer, is not showing an error message when importing an attachment with authentication.

For example, importing an attachment from Jira Server

https://<Jira Server URL>/plugins/servlet/raven/attachment/322/Word_attachment_Mapping.docx

The original is a simple Word Document. The attached is the HTML coding for the login page to instance of Jira.
 

And this is not showing an error/warning message regarding the authentication error, instead of this we have:

1 projects and 1 issue imported successfully!

And if you open the attachment, we have the Jira login page into the file.

Note: this is the same behavior if you import with
Jira - Importing Tests with (CSV)