I guess to have to submit your file afresh with new application fee. I found below information regarding incomplete applcations:
"Note: By signing, you certify that you fully understand the questions asked, and that the information you have provided is complete, accurate, and factual. If you do not sign and date the application form, it will be returned to you."
"If your application package is incomplete:
- we will return it to you;
- we will not create a file; and
- we will not keep a record until you have submitted a complete application."
Source link:
https://www.canada.ca/en/immigratio...269-applying-study-permit-outside-canada.html