get_header( 'customheader' ); ?>

Hi,

I am working on a development site: https://dev.straightforwardlegal.com/

I have created a custom front page template and want to have a header on it that is different from the rest of my site.

So far, I have created a blank document in Notepad and named it customheader.php then I uploaded it to the content of my theme in filezilla. It appears in my editor as customheader.php so I copied and pasted the content from the header I am using on the rest of my site and put it in the new custom header and proceeded to make the changes I wanted to my header in the custom header php document. Then, I went to my front page editor and changed get_header( ); ?> to get_header( 'customheader' ); ?>. However, the new header is not replacing my old header. Can anyone tell me what I am doing incorrectly?

Thanks,

Megan