Smart Sync Sync CLI or AppleScript

campmdabt  I wanted to do the same thing and was sadly out of luck.

Of course you can cat a file to ensure Dropbox syncs it but that's a bit slow for a large directory.  My solution was to read the first 10 bytes of every file in a folder recursively and in parallel.  This triggers Dropbox to sync the files somewhat efficiently and without forcing you to read the contents of all the files.  Here's the shell-fu to do it:
fd -0 -t file /path/to/sync | gparallel -j 30 -0 'dd if="{}" bs=10 count=1 > /dev/null '

That runs `dd` in 30 parallel threads. Requires the `fd` find alternative and GNU Parallel.  But easy to make work with the standard `find` and `parallel` tools as well. Cheers.