A delta app is build around a knowledge base. These are set of tabular data that provides information to the delta app. Only the account owner has access to the KB.
The app dashboard provides tools to maintain the KB.
read more on actions in the docs section
The images and media can be uploaded and managed from the apps dashboard.
read more on images in the docs section
In user data section of the dashboard, you can see user's responses. You can also communicate with users in this section.
read more on user dashboard in the docs section