Experts, kindly help!
I've received portal email. Finally!

1. Do I have to reply to them with the following details only?
Name, UCI number, email address, original entry date, date of last entry and port of entry.
2. I've received 3 emails as it's for Principal applicant + 2 dependents. So the above details have to be sent individually or just the main applicant can reply with details of dependents?
3. Do I have to send photos as an attachment while replying to this email? If yes, what are the specific measurement requirements for the photos?