Welcome to the screen on my doorbell. Are are (or will be) 3 options to chose from. The first is a preset message for quick access. The second is a custom message. Finally there is an image upload. The latter two can also be added in a repeating sequence.
The whole project plus two reference files for this project are listed on davidmcphee.ca which refer to the color scheme and how to add more buttons to the Quick Message and Quick Image options.