Drag and dropping files over the WIP does not work at least not always. Is this expected at this point?
When drag dropping from the desktop or windows explorer D&D works. However in my goto file manager Freecommander the D7D works for V5 but not the WIP.
So something is different in how the WIP handles a D&D from how V5 does that.
For testing you could run the portable (no install) version of freecommander to be found here: