Plex Cloud and Dropbox Smart Sync

Hi,

Does anyone know if it is possible to use PLEX Cloud with Dropbox Smart Sync, i.e. where your data is ONLY stored online.

I have added two folders, a folder where I have uploaded the files to drobpox normally, where the files take up space on the local drive, and PLEX Cloud has no problems seen this folder and the content of it, but I have also added a folder, where EVERYTHING is only online, and when I syncronise, I can only see the top folder, but not the content of it, neither the files nor the folders.