Hi Reinier,
There is a beta version on Android which supports the Phantom 3 Pro. You can find more information here:
Note that in the app you need to select the correct drone in the drop down list and to connect using a USB cable between the phone and the remote controller.
If you have an iOS device there is no beta yet. In the meanwhile, you can use the DJI Go app and fly the drone manually. The DJI app can help you to take the images: set the timer to take the images and then fly the drone in a grid mode for example:
https://support.pix4d.com/hc/en-us/articles/202557459#label1
We will post update on the following post:
https://community.pix4d.com/t/4464
Best regards,