加拿大网签提交后，如何再补充材料？

加拿大网签被要求提交护照复印件，可实际上已经提交



昨晚10点多提交了网签，11点多收到Confirmation，后来又收到了一封new message，是个PDF，内容如下： You are expected to provide a COPY of your passport with your electronic application. If CIC needs your physical passport, CIC will request that you submit it to our office. CIC will also contact you if we require additional information,documents or an interview. For general guidance on what to expect, you can visit www.cic.gc.ca/english/information/applications or consult the “What Happens Next” section of the instruction guide associated with the application form you used.
请教各位，应该如何提交呢？有过相同问题并解决的请不吝赐教！