Follow these steps:

1. Log in to the Business Support Portal. 
2. Go to the Support Requests section to view the cases that you submitted.

   

3. Use the filter and sort function to easily find the case that you’re looking for, then click the case number on the left column to open it.

   

4. Under the Case History section, click Add an update. This will give you the option to submit files.

   

5. Click Browse and search for the file that you want to submit, then click Add Update.