UR816C / FL Studio Output Issue

I just got the UR816C interface to use with fl studio. I have 4 dynamic mics and one condenser plugged into the xlr inputs, and the signal lights will show green or red while I play. However, the signal isn’t making it through fl studio to record like it should. I previously had the UR44C and didn’t have this problem, so I’m hoping there’s an easy solution somewhere in my settings. Happy to provide any more information, thanks.