Suppose I have a folder structure as follows: Folder A contains File A and Folder B. Folder B contains File B. Something like:
Folder A
|- File A
|- Folder B
|- File B
The expected behaviour is that if I choose "Selective Sync" and click only "Folder B", this should locally sync Folder B and File B, but not File A. (ideally, a "-" sign should appear for Folder A with the option to click the checkbox to sync everything in Folder A).
The actual behaviour is that selecting Folder B (via the checkbox) automatically checks "Folder A", and Dropbox will attempt to locally sync File A as well as Folder B.
This is the behaviour on Ubuntu; if this differs on Mac or Windows please post below.