"Assignment submission" refers to the act of handing in or submitting a completed task or project that has been assigned to you by a teacher, professor, or employer. Full definition
Students often miss assignment submission deadlines and score low grades. (allassignmenthelp.com)
Students frequently miss assignment submission time limit and score low grades. (studentsassignmenthelp.com)
For instance, in the future, learners may expect assignment submissions to be acceptable via social media postings or text messaging. (elearningindustry.com)