Would love the ability to save screenshots directly to a Dropbox folder!
Moving to Feature Requests section.
Dropbox does have a pretty powerful API available: https://www.dropbox.com/developers
On a Mac you can do this without any changes to Zwift. When Zwift is not running, move your Zwift folder to your dropbox. Then right/control click on the folder in the new location and choose ‘Make Alias’. Then move the alias back to your pictures folder and rename it to Zwift. Then Zwift will think the folder is in your Pictures/Zwift folder but they will really be on your Dropbox. You might be able to do a similar thing on Windows using shortcuts.