It's great to have this sync files first option to back up important files first.
However, what about the other way round. A typical problem for me is, that I got on a trip after some weeks in office. While traveling I need to continue working on recent files, but syncing all files from the last weeks to my laptop takes ages. For sue, I can download the data manually from the website, but then I'm having the same problems as I had before there cloud storage services (multiple different versions of the same file, copying back and forth files between diferent computer, changing my folder structure across multiple inked files etc. ).
Having the option to click "sync first" to folders (or files online) so that these folders get prioritized for up- and download sync would be great.