Hello. I am an international student here in the United Kingdom studying and applying to attend a conference in Canada. I have received the invitation letter already. The problem I have now is that there is an option I have to upload an employment and which I am only working as a casual worker(contract) so letters aren’t give to such people unless employees. Which the options of documents to upload while filling the visa application for Employer letter, for the conference, can I upload a my student letter or is there anything I’m not doing right?