5184 x 3456 (300dpi; 17.28" x 11.52"), 3456 x 3456 (288dpi; 12" x 12" SQ), 5184 x 3456 (72 dpi; 72" x 48"), 1080 x 1080 (72dpi; 15" x 15" SQ.), 1080 x 607 (72dpi; 15" x 8.43").
Choosing a selection results in a full page refresh.
Press the space key then arrow keys to make a selection.