Multiple snapshots can be selected to be combined into one merged new snapshot. The last override applied to a component in the series of snapshots is the state of the component in the new snapshot.
Component Appearance - the last appearance override on a component in the selected series of snapshots determine the appearance in the new snapshot.
Component Position - the last position override on a component in the selected series of snapshots determine the position in the new snapshot.
Component Annotations - All visible annotations that are found in the series of selected snapshots are shown in the merged snapshot.
Attention: The order in which the snapshots are selected determine the order in which overrides are selected. A snapshot could be the first snapshot in the storyboard editor but the last to be selected to be merged. Component overrides on this snapshot wins in the merged snapshot.