This is sad. However, i think the transcript ought to be sent by your school, via the school's registered email.IQAS acknowledged the soft copy of the student transcript I uploaded after I had submitted but said it was unacceptable so I responded to the email detailing that I had already had the hard copy sent and it’s been dropped off at their office for many weeks now without acknowledgment either.
In my case, i just requested that my transcript be sent via email to IQAS, and i didn't bother sending via courier. They acknowledged receipt within 3 days.