Not working for two people doesn't make it 'anyone' Anyway, it is still working for me. Perhaps you could provide some more information.
a) Has it ever worked for you?
b) If not, have you gone into Account -> Sign In (or whatever the initial add account wording is) on Flux Studio and linked your Delta to the cloud?
c) Are you running the current version of the app through testflight on iOS (v1.1.1) or on Android?
d) Does it report anything about the printer, or is it just the camera not working?
That is the sort of info that needs to go with any bug report / issue raised, in order to get some idea as to what the cause might be! Otherwise, you might as well say "my printer don't print" and I'll have to ask "do you have it plugged in?"