It is common for applicants to update their documents submitted to a program. If this update is done before file review, this will have no effect on the application. The programs will have access to these documents for review on file review day.
If theses updated documents are added after the file review deadline, they will be dated with the date they were submitted by the applicant. If the program asks you to assign these documents this will not have a negative impact on your application as the program expects these documents to be added after file review. If this is not the case and you choose to submit a document after the deadline, this document might not be considered by the program as it will be a late document.