Turn on per-image captions
Enable captions, select an image thumbnail, and use the compact editor that follows the selected image.
PER-IMAGE CAPTIONS GUIDE
How to add text to every image in a Facebook Reel
Add an optional short caption to each image in a Facebook Reel so viewers can follow the message even when a photo needs more context.
Keep every message readable
Write one clear caption per image and keep it to 72 characters or fewer so it remains easy to scan.
Preview every caption
Use the Facebook safe-area preview, give text-heavy images enough time, and download one ready-to-post Reel.