Annotations are made by selecting the photo from the media gallery associated with a media capture card. They can also be made on a snapshot or shared media file during the active call. They are kept in a separate annotations field within the media object, with the actual annotation data stored as an svg. The original media is untouched. The annotations have to be applied separately. The Skylight clients automatically apply the annotations when displaying the photo or snapshot in the app. If the media is downloaded externally, the annotations would need to be applied to the original media file.