I’m sorry, I’m not a native English speaker, so please forgive any grammatical errors.
There are PX4Flow data in my MP monitor window but no OF data in log data.
log data:
https://drive.google.com/file/d/1ZAtqtj_ps67yPVePsIhgrnNWkVUfpjx6/view?usp=sharing
I did it from https://ardupilot.org/copter/docs/common-px4flow-overview.html.