When You Need To Explain A Late Submission messages in a Confident tone

I know this is late, and I understand if there are penalties—I still wanted to submit my work.

I’m following up briefly—thank you again for reviewing.

I just wanted to confirm receipt and thank you again.

I appreciate you taking a look even though it came in after the deadline.

I’m sorry this came in after the due date.

I’m submitting this late and understand the consequences.

Following up to confirm you received my assignment—again, apologies for the delay.

I appreciate your time in reviewing this, even though it’s past the deadline.