Custom outro is available for users on the Lumen5 Business Plan and above.
The outro scene is the last slide of your video and serves as an ending sequence. The default style allows you to upload a logo and display a line of text as a call-to-action.
To use your own custom outro, scroll down to the very bottom of your slides to find the outro section. Select the Layouts tab on the right side, then select the "Use your own outro" option. Once that's applied, you can click into the outro scene and upload your own photo or video outro.
Click here for the best dimensions for uploading your outro photo or video.