Recording file format on IPhone

Hi,
We are recording presentations which are used for a simulated Live Event later.
This works fine on an Android device, because the recordings are saved in mp4 format.
However, on an iPhone, they’re stored in a proprietary Apple format, so we can’t upload them to the Live Event software (it only accepts mp4). Can we change the format ManyCam stores recordings in on an iPhone?

Thanks,
Jozef