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

I wanted to submit this and acknowledge that it’s late.

I’m following up respectfully regarding my late submission.

I wasn’t able to meet the original due date and wanted to acknowledge that.

This came in late due to some unexpected circumstances—thank you for your understanding.

I understand the delay may affect my grade—I appreciate you still reviewing my work.

I’m sorry for missing the deadline. I’ve now completed the work and wanted to submit it.

I wanted to check if there’s anything else required from me.

I appreciate any feedback you can provide despite the timing.