hi philip. i don't have an iphone 11 but an xs max. my experience is that the iphone and ipad pro, for example, don't accept foreign input via usb. For example, I can't import photos from my Sony A7RIII into the iphone or ipad pro. This is due to the cam's data format (RAW). I assume that the data format (output) is not understood by the controller of the iphone. You have to ask the HP of asto c40 about it !
Greetings Christian