Submissions left in Draft (not submitted) status can cause problems for both instructors and students. Here are some of the issues that can arise and how to resolve them.
NOTE: You cannot manually change the Draft status. However, you can opt to grade the draft anyway and provide feedback.
Check Assignment settings.
Turn on Edit mode
Locate the Assignment.
Click the Edit menu (three vertical dots) and select Edit Settings option.
Scroll down to the Submission settings section and expand it.
Change/Ensure Require students to click submit button is set to No.
Change/Ensure Require that students accept the submission statement is set to No.
Scroll to the bottom of the page.
Click the Save and return to course button.
Repeat for each assignment in your course.