I am having trouble dealing with the last step (...."to add in a reference to the server file name of the file you uploaded .....") which is a result of my limited knowledge of php coding for which I apologise.
I'm not really sure how or where to add the code for this step into the contactus.php file and your guidance would be much appreciated. I have attached zip files of the two files I am working on.
Also, I am not sure if I am correct Eric, but I think there may be an error in the code you gave for adding an exception for the file field in that the final part of the code, ie !== 0") does not require the double quotes? - but as I said my knowledge of php coding is limited!