MMSMail Pro: Send audio/video in GMail
This is a pro version of MMSMail: https://chrome.google.com/webstore/detail/mmsmail-send-audiovideo-m/jopfgkamfbflnkdlmjnoidgbbjbhnogp?hl=en extension.
This allows you to record and send audio or video messages from within GMail.
The free version adds a signature in the email that the attachments were generated by this extension. The pro version does not add this extension.