Snapshot not sending files to dropbox

I install Snapshot 2 days ago, but still no file on dropbox of the backup, i readt on some threads on the forum that uses wpcron so it make take some time to show up, i have set to backup daily, 2 backup already and 2 days later and no files on dropbox still, i did put a subdirectory name just the name "foldername" without / do i have to ad a "/" to the subdirectory, any info or comments will be apreciated, just want to know if there is something wrong at my end on the settings. or do i have to wait some more days to show up on dropbox.