Why we require screen recordings?
A screen recording demonstrates bugs and makes it easy for other testers, test leads, QA managers and clients to see. Furthermore, it can be used to evaluate if it is really a bug or not. Videos provide more detail and include the steps to reproduce opposed to screenshots.
How to record your screen?
Things to keep in mind:
In Testlio, a video screen recording attachment has to be less than 10 MB and in .mp4 format so you will need to convert QuickTime files and compress them before you attach them to your bug report.