File name becomes dynamic parameter key in API Connector

I am now using the API Connector to download the PDF file.
The URL is specified dynamically by params (the parameter name is url).

The download itself is successful, but I’m having trouble because the file name is fixed to [url], which is the Key value.

When I send the file via email, it is not recognized as a PDF because the file extension is not .pdf, so it is not displayed.

My questions are

  1. can I change the name of this file?
  2. if not, what should I do when I send the pdf via email so that it can be displayed via email?

These are the two questions.

If you know anything about this, please let me know.

This is the URL of the PDF file using for validation.