Hi guys, I have the 10+ and DeX on macOS and it's awesome. But, all the articles (even on XDA) say you can simply "drag and drop" files.
I've found that I can indeed drop files from macOS Finder onto DeX and they get uploaded to the phone's Downloads (!) folder. Cool.
But I can't copy from the phone to the computer. Dragging from Samsung's Files app within DeX does not work. When someone works this out, please reply.