Find details of each class on the Oncall report for that day (usually the day before yesterday)
Log in as the teacher who taught the first class. Click 'Staff' and 'Lesson Comments', and navigate the the relevant class.
If the comment has a link to the video, click the link to make sure it points to the right video. If so, mark the "Vid check" box with an "x" just like you do for processing 1on1 vids
If any video isn't there, find it in flipgrid and add it to the comment with the same method you use for Processing 1on1 videos, then mark the check box with an "x"