Mote

 Have you heard of Mote?  It is a free (although there is a paid version as well) voice recording Chrome extension for Docs, Sheets, Slides, and now Forms.  To add Mote, go to the Chrome Web Store and search for Mote.  The direct link is here.  

With the free version, you get:

• Unlimited voice notes
• 30 second limit for recordings
• No transcription

Just click "Add to Chrome".  After you add Mote, click on the puzzle piece 

then click the picture beside Mote to pin it to the extension bar.  

Here is the overview from the developer:

Welcome to Mote: the Chrome extension that lets you easily add voice comments and audio content to shared documents, assignments, emails and forms.

Mote is integrated into Google Docs, Slides, Sheets, Forms and Classroom - and Gmail - for easy recording and playback. 

You can also create voice notes for any website or application directly from our Chrome extension menu - simply click on the browser icon to access our 'Motepad' recorder."

Here are some videos that show Mote in action.

Using Mote in a Google Doc:

Using Mote in a Google Form:

Using Mote in Canvas: