It's been almost half a year since Canadian couples reunited for immigration physical examination. Why didn't you send the letter?

Normal. It takes ten months to send a letter after the medical examination of Canadian couples, so it is normal for Canadian couples to not send a letter after six months of medical examination. Sticking a letter is the last step of online signing. Applicants need to mail the original passport to the visa center, and the visa center will send the passport to the embassy for pasting.