If students are submitting handwritten, you can give them instructions on how to scan and submit the work from their smartphones. While students can send you the scan a variety of ways, the instructions give an easy way for students to submit their work directly to a Moodle Assignment activity.
Pros: Free. Relatively simple. You can share these scanning instructions with your class.
Cons: Annotating online is not as easy and marking up on a piece of paper.
Expert: Alex Savoth, Sharon Strauss, Charles Woodard