The College Board's online testing portal failed to handle HEIC image files, causing some students to fail their AP tests. The issue arose because the portal only supports JPG, JPEG, and PNG formats, while HEIC is the default format for iPhone photos. Students who tried to upload HEIC files experienced errors, and some were unable to submit their tests. The College Board has since allowed test-takers to email their submissions, but this solution is only available for future exams.