I only want certain items to be uploaded to Dropbox

I was able to successfully integrate but now I only want certain items to upload to dropbox. I am collecting logos and that is the only item I want in the dropbox. It is collecting a image of the form as well. 

Unfortunately, it is currently not possible to send the file uploads only. By default, the PDF submission and the other uploaded files will be forwarded to Dropbox.

Thank you for understanding.