Printer Spreads: These are imposed for saddle-stitch printing. Pages appear in printing order (e.g., 12|1, 2|11, 10|3...). We'll reorder them into reading sequence.
Reader Spreads: Pages already in reading order. We'll split each spread into individual pages for the flipbook.
Tri-Fold: Upload exactly 2 images - the outside (3 panels) and inside (full spread). We'll arrange them into a 4-page flipbook: cover, inside spread, back panels.
Z-Fold: Upload exactly 2 images - front and back. We'll split each into 3 panels for a 6-page accordion-style flipbook.