This tutorial explains the process for working with transparency and luma mattes inside Previz scenes.
Dec 10 2020
"Previz is an extremely useful app. Especially for checking camera angles with the presenter and backdrop, and coordinating/storyboarding graphic content."
"Previz helped dramatically when we had to present work in progress to our client. It was also critical for understanding how the content worked at a large scale both in terms of speed and relative size."