Ok I've been trying to make a day/night time lapse using the time lapse movie function on the 5D IV but could not get automatic ramping of exposure. Have tried AV, P and A+ modes but all seem to only take the first shot to set exposure for the rest of the time lapse sequence. The only thing I haven't tried is M mode using auto ISO. But thats not ideal using only ISO to determine correct exposure. Can someone confirm that the 5D IV time lapse movie mode does not have automatic exposure function?