When a screencast is necessary for us to reproduce certain behaviours, we recommend using the tool “Screencastify”.
When using the free version of Screencastify, you can record up to 10 screencasts for free, which are then stored on your Drive.
After those 10 screencasts, you can delete old ones and are then able to record new ones.
A benefit of using Screencastify is the ability to create a shareable URL without having to download the video and send it as an attachment.
You can find more information here: https://www.screencastify.com/
Note: we are not sponsored by Screencastify, but have seen the benefits of using the tools and are therefore recommending it.