
If automatic Smart Sync is on, you can’t choose this option because your files already default to online-only.Click the dropdown next to Files added on web default and click Online-only.

To make all files that you add to online-only by default: Set files you add to web to online-only by default Note: If an application on your computer needs a file to be local to function properly, automatic Smart Sync will set it to local temporarily and return it to online-only later.

You can only open it if you’re connected to internet.

If you set a file or folder to online-only, you’ll still see the file or folder in the Dropbox folder on your computer, but it’s just a placeholder. This means that they take up space both on your computer’s hard drive and in your Dropbox account and are available whether you’re online or offline. If you’ve never turned on Smart Sync or set a file or folder to online-only, then all of the files and folders in the Dropbox folder on your computer are “local”.
