How do I prevent Dropbox from automatically creating a Zip file from a file I am Uploading? This is not a folder of multiple files, but a single file. I need it to remain in its current Schrivener writing program format, so I can sync it with my other devices (iPhone and iPad), and when Dropbox changes it to a Zip file upon upload it's becomes useless and won't sync. The file is approx. 12 MB.