Thanks to ‘Unity Technologies Japan’ for developing Frame Capturer
A cutscene can optionally be rendered for external use with some other video editing or compositing software. This can be done both in the editor as well as in runtime, with the relevant “Render” button found at the top of Slate Editor window. Doing so will open the Slate Render Utility. Please note that you will need to download the free “Rendering Extension” from the Downloads section and import that into your project for the Rendering Utility to show up.