Karen Hogen (@KarinHogen) generously has shared her workflow for turning in student work.
Edit the Document Title
When students create a document in Google Drive they put the word “UNGRADED” at the end of the document title when they are ready to submit the assignment.
The teacher can then type the word “UNGRADED” into the search box at the top of Google Drive to find all the assignments that need attention.
The teacher edits the name of the document title with codes such as “REDO” or “GRADED.” Now it is clear to the teacher and student as to the status of the document.