How can I customize buttons on the Camera screen?

We do not have an option for such customization at the moment as per our information for most clients a single general UI for the Video Editor is more useful.

All the available customizations are listed here: iOS and Android.

But if you’d like to have an option to customize buttons or anything else that we do not generally offer, then you can talk it over with your Account Manager or Sales Rep to see if it would be possible.