If students have attached files linked to Google Classroom tasks, you will be able to check them by clicking on the right button on the header of the task’s column, showing a contextual menu where the “See attached files” option appears.
When selecting the “See attached files” option, a modal window pops up with the list of students that already have finished files of that task, showing also the number of files that they have attached.
When clicking on the student, another modal window pops up with the list of files that particular student has presented. If you click on one of these files, another browser tab will open showing the file in Google Drive.
If the student only has one attached file, it would open automatically without having to go through the attached files selection window.