Hi. I have a question and I really need help at the moment. I applied for my study permit extension on January 2020 and today I received a letter of refusal because I haven't provided my current custodian declaration. They asked me to provide it so I'm wondering if I had to do it all over again or just attach an additional file and if I can attach a file, how can I do it? because I've tried so many times but I can't figure out a way to attach an additional file. Thank you and have a good day!