There are two methods that I have used to complete this process. I have used the Explain Everything app on my iPad. This app allows you to bring images in directly from Dropbox. This means I don't need to save the images to my camera roll first. Once I have the image opened in the Explain Everything app, I can annotate over the image and use a point to highlight items that need some brief reteaching or praise. Once my feedback is done, I then export the finished product into the student's folder.
**The reason I chose the iPad as the winner was based on Explain Everything being accessible on the iPad. It is an Android app as well, but there is a different process for obtaining paid apps on the LearnPad marketplace.
One problem with Explain Everything is that it cost money to purchase the app. Another alternative that I have used is the TechSmith Snagit extension for Chrome that recently enabled screencasting. I am able to open to open Chrome, open the web version of Dropbox, open the student's file, view the original size of their file, open the Snagit recording option and provide my video feedback .
The only downside to this option is that when I am done, the video is automatically saved to Google Drive. This means that I have to go into my student's Dropbox folder and upload the video file into their folder so they can see the video feedback I provided. If we used Google Drive as our cloud storage workflow option, this method would work seamlessly. It still is a great FREE option for providing video feedback.