In my 4th grade class, students completed several projects using Google Draw and Google Slides. I've already provided feedback and grades to students, but hadn't had a chance to let students go back and revise their work a final time. I figured today was the perfect chance to do that. I've been logged on giving students feedback during that class as well.
I was observing in a 8th grade classroom a couple of weeks ago and saw another great example of collaboration. Students in this social studies classroom were working on Slide Presentations as a group -- each group was assigned a region of the world and time period to analyze. There was a student absent who logged on during class and was able to participate through a shared document from home.
Google Apps and Google Classroom provide students that great opportunity for communication and collaboration.