I made this explainer video showing how the native iPhone camera app works with the OM6 gimbal. I have tested the Blackmagic app and the results are almost identical:
Hello, there. Thank you for reaching out. You may use your preferred software on your device and the gimbal will act as a stabilizer only. I hope this information helps.
You can actually get it to have the record start/stop option as well. Go into the Blackmagic app and Settings - Camera - toggle On “Use volume button to trigger record”.
This will now allow the record feature to work through the gimbal.