If the could could send and execute a .gcode it should be possible to do that locally with Cura or an PC software.
Without knowing in detail how the transmission between cloud and box works i could only assume.
Connecting to the box IP I get into the switch web interface. I can se the local storage configured as a NAS.
Only guessing wild here but i think it should be possible to locally save a file on the NAS from Cura without the hassle with SD card.
That would be an true upgrade to the box and resume the original expectation we had for it.