Hi Frederic,
To use our app with the Phantom 3 Advanced, please follow our getting started procedure:
- Android (v2.1.1): https://support.pix4d.com/hc/en-us/articles/202557269
- iOS (v1.1.0): https://support.pix4d.com/hc/en-us/articles/204692015
Let us know if you still have issue.
Best regards,