I have received an email on 26th without attachment. But it is fine.
You can call the Panel Physician and book an appointment. Say that you don't have the MR attachment and they would ask your UCI. The Panel Physician can check in their emedical list or whatever list with your UCI and confirm if you are in slot to do medicals. They will give your IMEI number as well. I have got mine.
(I spoke with CIC Call Center and got this suggestion. Looks like the attachment is not important)
This is my first post in the forum. I have been a mute spectator, but I thought this information would clear some of your doubts regarding the missing attachment.