Posting Constraints
Platform posting constraints by network
Unified APIs help normalize the workflow, but product teams still need to respect each network's media, caption, and post-type rules.
Last verified 2026-06-23
Common constraint categories
Most publish failures come from media shape, post type, account eligibility, or permission scope mismatches.
ImagesAspect ratio and count limitsCarousels and multi-image posts vary by platform.
VideoDuration, size, codec, and thumbnail limitsShort-form and feed video paths may differ.
CaptionsLength, mentions, hashtags, and link previewsSome platforms rewrite or suppress previews.
SchedulingImmediate vs future publish supportSome networks support scheduling through the API, others need provider-side queues.
Account typeBusiness, creator, page, or organizationEligibility can differ even inside one platform.
FAQ
Can UniPost make every network accept the same payload?
UniPost normalizes the API shape, but each native network still decides what content and account types are valid.
Where should validation happen?
Validate early in your product where possible, then rely on UniPost status and webhooks for final delivery outcomes.