dropbox smart sync my hard drive is full

Some USB drives, forĮxample, take some time to mount before your computer recognizes them.

Your Dropbox folder must be available when your computer boots andīefore the Dropbox desktop application starts. You may encounter problems if Dropbox occasionally can't access the detached volume holding its folder, however. That said, you can change the location of the Dropbox folder away from its default of ~/Dropbox, so if you have a separate internal or external disk you could put the Dropbox folder there. Dropbox will remove the folders you unchecked, saving space on your Mac. Uncheck the box next to the folders you don’t want to be saved locally. Click on the double arrow at the bottom of the sidebar.

As far as I'm aware, you can't mount your Dropbox account as some sort of remote file share - its synced files are always written to your local disk. Launch the Dropbox app from your Applications folder. Update: See nassimhddd's answer below about ExpanDrive allowing you to mount your DropBox account as (external) drive - since

Dropbox smart sync my hard drive is full