Will the panels line up when I post them?

Yes, as long as you upload them in the numbered order Pressbook exports. The slices are cut from one canvas, so the seams meet exactly.

Can a carousel have both photos and video?

Yes. Any panel can hold a clip. Export a still set for the feed, or an MP4 or reel when you want the motion to play.

Portrait 4:5 takes up more of the feed and generally performs better; square 1:1 is safer if the composition is centred.

Carousel

One wide canvas, not ten separate squares. Photos and video span the cuts, so what you swipe in the app is exactly what people swipe in the feed.

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iPhone and iPad · iOS 18+

Pick photos and clips - Choose from your library. Video is welcome in any panel, trimmed on a real timeline and muted per panel if you want it silent.
Compose across the cuts - Layouts open as a live preview with cut guides showing exactly where each swipe lands. Heart the ones worth keeping and Pressbook reopens with your last setup.
Export for the feed - Numbered stills in swipe order, one MP4 with sound and HDR kept, or a continuous reel where the camera travels the whole canvas in a single take.

Will the panels line up when I post them?: Yes, as long as you upload them in the numbered order Pressbook exports. The slices are cut from one canvas, so the seams meet exactly.
Can a carousel have both photos and video?: Yes. Any panel can hold a clip. Export a still set for the feed, or an MP4 or reel when you want the motion to play.
What size should I use?: Portrait 4:5 takes up more of the feed and generally performs better; square 1:1 is safer if the composition is centred.