All files moved online

Thanks for confirming that, renikolopov, I think that should do it.

Keep in mind that if you're using the File Provider version of the Dropbox app (Dropbox folder location in ~/Library/CloudStorage), it's expected behavior for Dropbox files not previously set to "available offline" to be automatically set to "online-only" when your hard drive is low on disk space.

But you can always manually set them back to "available offline" to resolve this.

I hope this helps!

Yes, once manually returned to offline mode, they stay offline. 

Thanks for the additional info, renikolopov​.

Just to confirm, if you go to your Dropbox folder and choose to manually make files or folders available offline, does it work?

And do they stay in that state or do they change back to online-only automatically?

Currently, I have about 100GB free, but that is after I have manually made the most important (and the biggest) folders available offline.

The issue with subfolders was solved after I repeated the same request to make the whole folder available offline. 

I am happy to share any additional information, but I am not sure which one. The screenshots just show most of the folders as available online only (a cloud with an arrow), but according to my preferences, most of them are supposed to be available offline. 

An important piece of information is that the problem occured shortly after installing the updated  MacOS. 

The most important to me is to understand how to prevent this from happening again, since I discovered it when it turned out I can't do an urgen work during an air flight, since the files were not available.

Hey renikolopov - sorry to hear you're having issues with this.

Can you please let us know how much hard drive space you've got available on your computer at the moment? 

Is the app working normally, if you navigate to your sub-folders and make them available offline?

Any  additional information or even screenshots are more than welcome!