The 121Writing is now called Kaizena. This is a great application that allows you to add audio comments to the content of your Google documents. This could be a good way to deliver feedback to your students. I have already created a visual step by step guide on how to use what was called then 121Writing which you can find here.
To use Kaizena , you need to be logged in to your Google account and just like any other third party application, to integrate Kaizena into your Google Docs you will have to grant it access to your Drive. Here is a good video Richard shared on his post, watch it to learn how to use Kaizena to add audio comments to your Drive documents.
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