Hey everyone, thank you for your continued feedback!

Developers are able to offer a mobile view of their Twitch Extension by providing an additional version that acts similar to panels on a channel page. The icon to open the mobile version is located on the chat tab in the Twitch mobile application.  An overlay view for a Twitch Extension is specifically intended for viewing in a desktop web browser and this functionality is currently not being investigated for mobile use. 

For services that provide overlay graphics via Twitch Extensions, we recommend that these views be made available as browser sources for broadcasting software if viewability across all viewing destinations (e.g. desktop, mobile, console) is a high priority for your use case.

Thank you again for this feedback, and please let us know of any additional suggestions you may have in the future.