If you're uploading a photo of a document to Google Classroom, use Google Drive. It has a built-in feature for scanning documents with your phone's camera.

I walk through how I set up and use Google Classroom to make teaching easier and more organized. I show how to create a class, invite students using a class code or email, and share assignments ...

You can create a Google Classroom to virtually manage, collaborate, and track class progress for free using your G Suite or personal Gmail account.

Now open to all Google Apps for Education users, Classroom helps teachers work with students in and out of the classroom.