1. A method comprising: at an electronic device comprising a processor and memory: receiving an input to close a media item residing on the electronic device; in response to receiving the input to close the media item: identifying a current user position within the media item; storing the current user position; receiving an input to access the media item; determining an elapsed period of time between receiving the input to close the media item and receiving the input to access the media item; generating a content summary for a portion of the media item associated with the current user position based on the determined elapsed period of time by: retrieving a pre-generated summarization of the media item; and identifying a portion of the pre-generated summarization that corresponds to the current user position; and presenting the identified portion of the pre-generated summarization to a user of the electronic device.