Additional document via webform

[CancelEducational745]

Anyone having issue with webform to include document? My wp arrive late after submission so i raise a web form to include it on march 11. Called IRCC today and the agent told that they not seeing anything on my application. Suggest me to raise technical webform along with re-submit my wp. What should I do to make sure the additional document is attached and not delay my file? Thank you everyone,