the camera records to the SD card in one minute increments even in continuous recording.
you can do one of two things to solve this.
pull the sd card after you are finished and merge all the 1 minute clips together in a movie maker program ( many are free)
or 2. go into playback in the app ( this accesses only the sd card) and playback the entire event you want. while doing so press the record button in the app which will “record” the entire playback in real time to your phone.
neither is particularly appealing in terms of convenience but those are the options at hand.