We know creating great personalized themes for your In-App message takes time, so we want to make sure you don't bother creating the same theme over and over on each one of your apps.
Duplicating a theme
To do so, simply go to Settings > Themes. Here is your usual overview of the available themes for the app.
Below your themes for the currently selected app are all the themes you created for your other apps. In order for these themes to be available on the app you're in, hover your mouse on a theme then click "Attach".
You should now be able to use it for your In-App messages and Mobile Landings.