Hi Christopher,
Thank you for sharing your experience with us.
Currently, Pix4Dcapture is not compatible with Android Pie 9.0 hence the issue you are encountering.
The developer’s team is looking for a solution to the problem and it will be fixed in a future release.
I would advise you to follow this threadwhich is dedicated to this particular issue. We will communicate on it when the bug will be solved.
In the meantime, there is no other workaround than using a mobile device running with a previous Android version.
Thank you for your understanding,
Best,