You can directly send a file to Dropbox from SOHODOX. 

To start using this feature, you must have a Dropbox account and the Dropbox client software must be installed on the machine on which SOHODOX is installed. SOHODOX now has a new special tag called Dropbox. 

Once you enable Dropbox integration, you can drag and drop documents to the Dropbox tag to make that document available in your Dropbox.

For more information on using this feature please read the below article...

http://www.sohodox.com/docs/help/index.htm?dropbox_integration.htm