Hi Sunil, I needed to convert my excel file below to pdf to be able to  submit my assignment as it would not accept xls format. I had done some last changes on the tab (Question 3) seen on screenshot below, saved my excel file and then clicked 'Save as' and chose the pdf format. All good, I thought, I uploaded the pdf version to the university not realizing that only the open tab had been converted. I found out when I received my result and only Question 3 (tab 3) as visible had been marked. Since I opened my excel document in order to highlight figures with the solutions provided, my excel file shows 'modified' (2nd screenshot below). If I can proof that this excel file is the file that I converted into the pdf which I submitted, I might have a chance of the other questions being marked. That's why I need to know if there is a way to trace source document (my excel file below) to the pdf version submitted. IT department of the uni advised there would be no way to trace this...only the creation date of both documents would lead to the presumption that my excel file below is the one I converted into the pdf submitted. Hope this makes sense? Can  you help please? Ulrike ... View more