An electronic device displays an image in a sequence of images. The sequence of images includes a representative image and images acquired by the camera before and after acquiring the representative image. While displaying the image, the device detects a first input and, in response, displays a user interface for trimming the sequence of images. The user interface includes: representations of images in the sequence of images; a begin-trim icon that delimits a beginning image in the subset of the sequence of images; and an end-trim icon that delimits an ending image in the subset of the sequence of images. The begin-trim and end-trim icons are located at positions that are automatically selected by the device. The device detects a second input and, in response, trims the sequence of images to the subset of the sequence of images based on the positions of the begin-trim and the end-trim icons.