Thank you for your comment. I'm sorry for not being informative. My application is study permit extension + initial co-op work permit, applied within Canada.
Is my case also considered as the ghost update even though there were actual update being made? (In the Document Status section, it lists newly approved documents - Study permit and co-op work permit- and says 'Your document is vaild')
The PDF file that I am looking for is the file is the letter that approves that I successfully extended my study permit and got a new co-op work permit.