Instagram Adds Per-Slide Captions to Carousels, Enabling Annotated Visualizations and Multilingual Posts

Instagram now allows creators to attach distinct captions to individual slides in carousel posts, which can contain up to 20 images. Previously, carousels supported only a single top-level caption, forcing workarounds for annotated data, multilingual content, or step-by-step instruction. The feature opened 18 June 2026. Developers using Instagram's Graph API must audit integrations to handle the new per-slide caption fields and avoid schema mismatches.