How to disable desktop sync for certain Groups/Users/Folders?

hi!

I’m looking for a solution.

I’d like to give a special user group permission to access directly their files by IOS or android app - but only the automatic synchronisation should be forbidden. I want to avoid that important data is stored (through synchronisation) on a mobile device which can be stolen or lost.

Is that possible ?

In my opinion the “file access control app” blocks completely the access by IOS or Android app.

Thanks an advance,
Raphael