Hey @janTatang,
Thanks for using the dev forum!
We do not have an official guide for this yet, but I wrote a short tutorial for this here: I want to add a custom button in the meeting option toolbar in my zoom app in ios. I see there are provisions to hide or show the toolbar or even specific buttons. But is there any way to add a custom button in the toolbar under more in IOS? - #9 by Michael_Condon
Thanks!
Michael