I'm using the available version of EKOS from the PPA running on a RPI3 with Ubuntu Mate installed.
The (remote) client is a Windows machine.
Whenever I take a new preview I can see and ear the DSLR taking a new picture, I can see EKOS counting down the exposure time and I can see it downloading the image from the DSLR but.. the image I get into the FITS image viewer is always the same, even the temporary filename of the file.
I have the system setup so that the DSLR sends the image into RAM (not to the SD card) and I've selected "local" on my EKOS client.
Setting to RAM vs SD Card was done automatically by the driver, but now I changed it so that you explicitly set it. Should be in PPA tomorrow for testing.