“In Google Classroom when you attach a Google Document to a lesson set where every student gets a copy the student does not see the thumbnail image of the document. The student needs to click on “OPEN” to view the attached Google Document. Note that in Google Classroom the copy of the document is not made until students click on “OPEN” and click on the attached file.
Attach an Image
I have created an image that I attach with each Google Classroom assignment to remind students to click on “OPEN” and either “MARK AS DONE” or “TURN IN.” I have saved the images in my Google Drive so I simply click on the Google Drive logo when attaching files in a Google Classroom assignment and insert the image.” To read further please click here: http://www.alicekeeler.com/teachertech/2015/01/26/google-classroom-use-this-image-for-students-turning-in-work/