At an electronic device, a user input is detected that corresponds to a respective user interface element in a portion of a user interface that is associated with a first standard gesture recognizer and a first supplemental gesture recognizer. The user input is processed in accordance with the first standard gesture recognizer and the first supplemental gesture recognizer. In accordance with a determination that content associated with the respective user interface element cannot be added to a drag operation, the device fails to recognize the user input using the first supplemental gesture recognizer, and processes the user input using the first standard gesture recognizer. On the other hand, in accordance with a determination that the content associated with the respective user interface element can be added to the drag operation, a gesture is recognized using the first supplemental gesture recognizer and the content is added to the drag operation.