Hi Thomas and Fernando,
Thank you for your interest in using Pix4Dcapture.
We have not tried to fly a drone built with the A2 or A3 flight controller of DJI with Pix4Dcapture. Apparently they both support DJI SDK so we expect that our app is compatible with the drone you built as long as the camera can be controlled, meaning that the app will be able to trigger the shutter of the camera if the connection is reliable.
To know that, you could simply use DJI GO app and check if the telemetry and the video feed are working in the DJI app. If they do, then taking picture with Pix4Dcapture could work.
Note that depending on the SDK supported by the flight controller, either SDK2 and/or SDK3, only the iOS might work. Currently Android supports SDK2 and iOS supports SDK3. The SDK3 compatibility will come very soon with the new beta version of Android (in less than a week).
If you give the app a try with a DJI flight controller, we would be very interested to have your feedback. We only suggest that you try it if you are an advanced user because taking over manual control might be needed.
To do a mission with Pix4Dcapture, you will have to select a drone. You could then select any DJI drone having the same connection mode as you drone, usually Wi-Fi (P2V, P2V+, P3S) or USB cable (I1, P3A, P3P, P4).