Is there a setting to allow folders to be uploaded from a PC/Mac to an Android phone via bluetooth? Reason I ask is because I get an error message saying that the type is not acceptable/supported when I attempt to drag and drop a folder into the window on my Mac showing the contents of my Android SD card. 

Using Astro Bluetooth on Sony Z1 Compact, latest Android. Mac OS Mavericks.

Looked around here on SE but couldn't find an answer that addresses this issue with folders.
I use an app called AirDroid which allows me to upload folders/files to my Android phone. It is not done via bluetooth, however. It's done through my 4G connection.