To upload your flipagram video to Instagram, first run through the flipagram and save your final video production within Camera roll.
Now head over to the Instagram app. Tap the center buttom at the bottom to upload your flipagram video.
Change the selection to video view and select the video from your camera roll library.
Now you can pick the flipagram either straight from your camera roll or from the flipagram library. Now you can go through the usual video uploading steps through instagram and your fliapgram video will be uploaded!