Here is the relevant FAQ: <quote> Can student submit an HEIC file of a photo of their handwritten work? Recent iPhones and iPads save photos as HEIC files. HEIC photo files can’t be submitted “as is” in the online exam. They must be converted to an accepted file format. Here are two ways students can do that: Update their Apple device settings before the exam so that their photos will be saved as .jpeg files: Settings > Camera > Formats > Select “Most Compatible” OR Resave the HEIC file as an accepted file format: the easiest way to convert an HEIC file is for students to email it to themselves using the iPhone or iPad Mail app. The attached image will automatically be converted to a JPEG. </quote>
I guess we think it is too hard for an AP student to actually read and follow instructions.