Needs serious help. I use the app to co-write books with my friend since I can't find any similar alternatives. It has really great collaborative functions, but it only works seamlessly about 50% of the time. When the doc starts to get past 100,000 words it takes too long to load and to synchronize between our separate devices, loses it's scroll assist slider, puts your cursor in random places, and glitches A LOT. Please blow the dust off this app and give it an update!