Awesome that works perfectly, thanks Simon. Was just the upload-dropzone stuff I was missing.

Just for future reference if someone stumbles on this using the code above, you can substitute out the last line for //Change Upload Label with the below to change the subject, description or attachment label/titles

//Change the subject label text
       $(".request_subject #request_subject_label").text("Add your desired Subject text for the specific form here")

//Change the description label text
       $(".request_description #request_description_label").text("Add your desired Description text for the specific form here")

//Change the attachment label text
       $("#upload-dropzone").prev("label").text("Add your desired Attachment text for the specific form here")