When performing a time lapse update, it appears seestar currently just creates a mpg file where each image is a frame. Doing a 6 hour lunar eclipse with 10 second interval resulted about 150Kb per image when extracted from the mpg. This is well below the resolution of a fit file.
When doing a time lapse each individual fit and resultant jpg file should be saved in stack, just like the stack created when doing deep space.