you cannot sync to personal accounts you cannot merge two personal accounts and you can't merge a computer in a cell phone if one of the computer or cell phones have already downloaded the Dropbox app. I have two accounts and I backed up all my Dropbox photos to One account that hasn't any storage and they were backed up to the wrong account or merge. Dropbox is now deleted all my pictures so I'm Missing Years of pictures because of this snafu or fubar or just stupidity. I wish I had never chose