Hello everyone recently I think I want to get new frame so I decided new frame on dodecacopter but after watching this video
But now I facing some problem like “how to convert .cpp file to .apj file” anybody can help me please 
Thank you 
discuss.ardupilot.org is a better place to ask about ardupilot.
https://ardupilot.org/dev/docs/building-the-code.html
might answer your question though.
I was asking question 2 days ago but no replies so I want to put my question here so now I have solution from giving you
Thank you thank you soo much sir 
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Thank you 