[Zubersoft]

No, the sync to cloud folder option is meant to allow a group of users to keep their libraries in sync. One user can upload changes and the others can download changes from that folder. If you copy a file to the dropbox folder, the database file that is kept in that dropbox folder won't be updated to know that file exists (and there wouldn't be a corresponding song entry for it). There is no sync to cloud option for an individual user, because that is essentially no different than you just using Import->Batch Import or Import->Dropbox to import new files or to import changed files to update existing songs. Files by themselves don't equate to songs in MobileSheetsPro, which is why a database file is necessary in the cloud folder to track that information. 

Mike