When feature layers are stored in the map, only the map author can edit the features. In other words, your edits are saved when you save your map. These types of feature layers are useful for displaying information such as events happening within a community or inventory of oil production facilities. If you have features in delimited text file or GPX file, you can import them into your map. See Adding features from a file for more information. Feature layers that are part of the map are also an easy way to add a small number of features, for example, the swimming pools managed by your city's parks and recreation department and when you don't have access to ArcGIS for Server for creating feature service layers. See Creating editable layers for more information.