Occasionally you may not have time to vote but still want to receive maximum exposure boost.
The AutoFill allows you to take the day off from voting by automatically filling your exposure boost in all the challenges which you are participating. This function does not keep the exposure boost up for the entire challenge but simply allows you to "Skip" a voting session.
Note - The AutoFill does not automatically vote for random photos, it simply fills up your exposure meter.
Once you use an AutoFill the exposure meter will start to decrease the same way as if you have voted.