Answer:
Videos created within Microsoft Teams are saved to a service called Microsoft Stream. You can access Microsoft Stream at the following web address, using your University of Brighton Office365 credentials: https://stream.microsoft.com
The following video explains video permissions in Microsoft Streams:
If you want to make your video available permanently then you need to download it from Microsoft Streams to your computer and then upload the video to Panopto. You can download your videos by logging into Streams > going to my content > clicking the three dots on the right of the video > select the option to download. Here is the guidance on doing so. Stream-to-My-Studies-Panopto