basically you need an Entity with Generalization System.Image – this is where you are going to store the pictures you take with the phone. An Image is a specification of System.FileDocument. The data is stored in the Attribute Contents (A Binary attribute).
To take a picture with your phone, just place the widget in the dataview of this entity. To show the image in an overview, you can use the image viewer file widget and just place it in the context of the Mobile Image entity.
thanks for the answer, it works now