Dear Sis & Bro,
Looking forward to hearing your thoughts! Sis & Bro UAK.zip
Subject: Sis & Bro UAK.zip
I've attached a file named "UAK.zip" to this email. I think it could be [something you've discussed before, a surprise, a necessary document, etc.]. I'd love for you to take a look and let me know what you think. Dear Sis & Bro, Looking forward to hearing your thoughts