After turning on Automatic synchronisation of my Goodnotes files to Dropbox, I discovered that this feature takes over an enormous amount of the HD memory, in fact if left it alone it will take over all your HD. I discovered this when I ran out of memory in my HD and discovered that the Dropbox cache was 500GB. It took me some time to figure out why I had lost this enormous amount of memory. After erasing the dropbox cache, it immediately started filling up again and in one day it was already 100GB large! At the moment it copies into the dropbox cache one copy of the entire file I am working on every single time I make a small change. As I have been working entire days on goodnotes, this very quickly fills my HD. I use other apps which backup automatically and DO NOT have this problem. There was already a complaint in early January about this same issue and you replied that to solve it one only needed to turn off the automatic synchronisation. This is not a solution obviously, it defeats the purpose of having the ability to back up automatically. Notability, your superb competitor, does not have this problem!