U can but it not a guarantee they would be able to link it to your file because u don't have a file number as yet, your application is not in the system, u can write a explanation letter explaining the reason why the PCC is not include in your application and send it by webform just make sure you include all of the information so that they may be able to locate your files an attach the letter to it,
examples like the date the file receive, name of vo office sponsor name pa name
