Using G.Drive App to Facilitate Student 'Think-Alouds'

My favorite updated Google Drive  feature is the ability to record video that is uploaded directly to your Google Drive account from the mobile app. Below are a few images:

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I love this new feature as it a) simplifies both the process of uploading and sharing video and b) because the video lives only in Google Drive, the instructor or the student can alter the sharing permissions easily. Because video can privately be shared between teacher and student, this new features allows for video-based demonstrations of understanding (Think-Alouds) and a myraid of other types of reflection that would normally require additional steps if using YouTube, etc., as a medium. 

I have begun to experiment with this feature as a way to facilitate a weekly "challenge" problem. Because the problem is recorded in my grade book as extra credit, I wanted an assessment system that ensured that the student at least articulated his or her thought process, rather than simply copy the solution from a partner or the internet. Below are the instructions I am giving students:

Below are three examples of submissions to the above problem I have received from students thus far: