If you record a video in landscape format (horizontal), and your branding is being applied at 90 degrees to your actual video, then this article is for you.
When you record a video in Brivvio, it takes a note of which way you are holding your phone (i.e: portrait or landscape format).
If you have enabled the Orientation Lock Setting in your phone's Control Centre, then Brivvio will not be able to detect which way you are holding your phone, and your branding may not be applied in the correct orientation.
The solution is to disable the Orientation Lock Setting in your phone's Control Centre, before you record a video.
Look for this button, and make sure it's not enabled.
For more on iPhone orientation locking, visit the Apple support page here.