As I said in the syllabus, assignments need to be handed in on paper, unless I explicitly agree to an exception for some reason. Email is acceptable only as proof that you’ve done the assignment: it will not be evaluated or graded unless and until I get a hard copy.
I hand back assignments when I’m done grading them. If you’re not there when I’m handing back an assignment, I’m just going to hold on to it until the next time I’m handing something back. If you want it back sooner than that, ask me for it, and I will happily give it to you before or after class.