Unable to export to dropbox

Hi, I wat to upload my file to dropbox in nodejs but its not working.

var options = {"exportURL":"dropbox://"};
client.html_to_pdf(`"${html_document}"`, options);
client.save("http://www.example.com/handler", function (error, id){
if (error != null){
throw error;
    }
    console.log(id);
 });

i just want to upload my file to created pdf directly to dropbox but this is not working. Can you help me out.

Thanks,

The option used should be exportUrl not exportURL.