Here are some resources to learn how to use Google Classroom.
Uploading a Picture to Google Drive: Use the following videos to upload a picture to your student's Google Drive. Once your picture is in your student's Google Drive it can than be "Turned In" as an assignment under the "Classwork" Tab. Note: The student's school email address must be loaded onto the student's or parent's phone/tablet that the picture is being taken from.
Uploading a Picture Instructions for Android.
Uploading a Picture Instructions for IPhone