Considering to start Rekordbox Cloud Sync, but don't know how to change rekordbox library connection from my External HDD to Dropbox location

Hi all,

Considering to start Rekordbox Cloud Sync, but I don't know how to change rekordbox library connection from my External HDD to Dropbox location.

I have already made a copy of my Itunes library file onto dropbox. 

How do I go about starting the cloud sync to the dropbox location? But all my tracks files were originally linked to the location on my external HDD, so I guess I would need to change all my rekordbox database and its linked file location to the dropbox???

Would this make it impossible to use rekordbox locally without wifi? 

Appreciate any tips and warning of what to watch out.