My Dropbox for Windows app is currently updating. The sync settings seem to have changed to be more compatible with Windows, I take it. It's still currently indexing, but anyway. I notice that instead of the green circle for an offline file, and the green check in a white circle for a folder that's partly online and partly off, the green check in the white circle now seems to mean "Available on this device" whereas the green circle means "Always available on this device."
I don't see any option to change the "available" files to "always available." Frankly I don't understand why there's a difference...? For files that aren't a folder, if I manually make them online only and then offline again, it seems to resolve the issue and make them always available, but this isn't working with a folder. The folder has four files in it, all always available offline. So how come the folder has the white circle with the green checkmark...? Shouldn't it be solid green?
Everything's still syncing so I don't know if this issue will persist with other folders I've had marked as offline, too. 
I read the details given here but this just makes it even more confusing and doesn't help the issue. https://help.dropbox.com/sync/sync-icons