Yes. Secondary email has been mentioned in my visa application. I too have mentioned in body of email that I am sending from my secondary email.

I was requested for additional documents on 11 August 2022. And I sent the documents on my the same day but didn’t receive any acknowledgment email. So I write follow up email just to confirm if they have received my documents. I got reply on 15th Aug 2022 that they have not received my documents. ...