Any status on updating these settings? My original image was just a placeholder. I think being able to change the image is important 
When I try to update, it says, “An extension already exists with this name”
To update images/screenshots you have to release a new version of the extension as far as I know
i’m talking about the logo/icon, not screenshots.
https://dev.twitch.tv/dashboard/extensions
Manage an extension
Settings
Scroll to bottom
Upload new file that is 100px by 100px has worked fine for me today.
Might have been a temporrary issue but seems ok just now