My system crashed hard, and I had to do a clean install of Windows 10. Luckily my Dropbox was setup in D drive. Now after I reinstalled Dropbox, it defaults to C drive as its location. When I try to change the location (using the Dropbox desktop app's Preference>Sync settings page) to the old location (in D drive) it says "This folder already contains a Dropbox directory". This wont let me point Dropbox to an old/existing Dropbox location which still may have some unsynced files. How can I force Dropbox to use my old location in this case. Help!