Why do carousels get higher reach than single static image posts?

Instagram re-shows carousels to users a second time starting from the second slide if they didn't swipe the first time.

Instagram Carousel Design That Goes Viral: 10 Slide Templates That Work | LaunchGremlin

Carousel posts generate the highest save and share rates on Instagram. Learn the hook-slide formula, seamless swiping UI, and call-to-action slides.