C1 Mobile for Sigma FP and Fuji GFX

I was hoping that C1 Mobile would be the solution to providing USB-C control of cameras like the Sigma FP L and Fuji GFX 100s - which don't already have a tethering option.

I ended up paying for a month of use as the Trial periods are too short - it was a pity as they failed my needs:

for the Sigma FP L - there is no Live View - kind of makes the process quite useless, as there is Sigma tethering in C1 for the desktop.

for the GFX 100s.  There is live view but then it just crashes and hangs.

Has anyone else wanted Live/tethering for the Sigma FP ad GFX with C1 Mobile?