I have an excel workbook saved to a Dropbox folder. I did some edits and would like to "save as" with a different name. However, when i click save as, I don't see saving to dropbox as an option. It simply disappeared as a "location", and when i try to "add" a location, dropbox is not one of the options given. Any ideas why this is happening? I'm using excel for mac. I am connected to the internet, and dropbox is running in the background/syncing. Thanks!