Social media publishing specs by network: carousel, image, and video formats in 2026

A single workflow can coordinate carousel posts for Instagram, LinkedIn, and X, but it should not send one identical carousel to all three. Build an Instagram-native carousel, a LinkedIn document or MultiImage version, and an X multi-image post or thread, then confirm the direct publishing path for each account.

Adapting one campaign to different platform formats is also the practical answer for long-form and short-form video. A YouTube video, TikTok post, Instagram Reel, LinkedIn document, and X thread can start from the same idea, but each needs its own media, copy, metadata, and approval check.

The same rule applies to recurring daily text-with-image publishing. This reference separates native platform formats from API publishing routes, so teams can see which asset to prepare, what limit to check, and when a native or reminder-based step may still be needed.

Which social networks can you publish to from one workflow?

• Instagram for visual, multi-asset campaign posts.
• Facebook for community updates and visual posts.
• TikTok for vertical video and photo-post campaigns.
• YouTube for short and long form video.
• LinkedIn for professional and document-led posts.
• X for concise updates, media, and conversations.
• Bluesky for text-led community updates with supporting media.

Social media publishing specs compared

What to look for in a cross-network publishing workflow

• Platform-specific adaptation: Change the copy, media, aspect ratio, title, metadata, and call to action for each destination instead of pushing one post everywhere.
• A real carousel plan: Decide whether the campaign needs an Instagram carousel, LinkedIn document, LinkedIn MultiImage post, X multi-image post, or thread. Those are different assets, not one asset repeated.
• API and native-app limits: Where publishing relies on an API, check its current limit alongside the native-app limit. They can differ.
• Long- and short-form video handling: Treat YouTube, TikTok, Instagram, Facebook, and LinkedIn as separate video destinations with their own requirements and review steps.
• Format-level confirmation: “Supports this network” is not enough. Confirm the exact network + format + account combination before scheduling.
• Approval before publishing: Give the team a chance to inspect the platform-specific version before it goes live.
• A native-app fallback: Keep room for a native or reminder-based step when the needed feature has no documented direct route.

Velocity: Best for adapting one campaign across several networks

Best for

• Teams turning one campaign into tailored text, image, carousel-style, and video posts.
• Marketing teams planning short-form and long-form video across connected channels.
• Agencies that need separate brand context, approval, and publishing workflows for more than one client.

What it does

Velocity's current Publishing page positions it as a social distribution workflow for connected Instagram, Facebook, TikTok, YouTube, LinkedIn, X, and Bluesky accounts. It explicitly says it does not publish search ads. Teams connect the profiles or Pages they manage, assign them to a Brand Identity, and decide when and where an approved post should be published.

That supports a workflow where one campaign is adapted into daily text-and-image posts, short-form video, long-form video, and carousel-style educational content. Velocity's current carousel FAQ says it can publish social content to connected accounts, but the carousel or media workflow must be confirmed for each platform because available formats and account permissions differ by network.

Velocity focuses on the social-media workflow: creating content in brand context, review, scheduling, publishing, and basic analytics. It does not publish a complete per-network format matrix, so a connected channel is not proof that a particular account can direct-publish a particular carousel, document, Story, or video format.

Last verified: September 27, 2026.

What you'll like

• One workspace for research, creation, review, scheduling, publishing, and basic analytics instead of a separate tool at each step.
• Brand context drawn from a website, past posts, guidelines, tone, keywords, and signature phrases, then refined before publishing. See Brand Agent
• A publishing plan that lets a team select the connected accounts that should receive an approved social post.
• A clear choice between publishing an approved post now and scheduling it for a future date, while keeping the final format check visible. See Scheduling

Why it might not be a good fit

• The campaign needs a documented guarantee for one format. Velocity's public pages do not state a per-account, per-format direct-publishing matrix, so that exact route must be confirmed first.
• The creative depends on native-only features. An in-app effect, sound, collaboration option, or sticker-based interaction may need a native completion step.

Instagram: Best for visual, multi-asset campaigns

Best for

• Showing a step-by-step idea through a native carousel.
• Turning a campaign concept into a visual feed post or short video.
• Keeping a strong visual story while tailoring copy to an Instagram audience.

What it does

Meta's Content Publishing documentation sets a separate limit for its API: a carousel can contain up to 10 images, videos, or a mix of the two. Instagram's Help Center says native-app users can add up to 20 photos and videos to a feed post. A 20-slide concept therefore needs a native or reminder-based workflow; it cannot be sent through the current API carousel route. Meta Content Publishing documentation and Instagram Help Center

For the API route, carousel images use the first image's aspect ratio, and JPEG is the supported image format. Meta also documents API rules for Reels, including a 3-second minimum, 15-minute maximum, 300 MB maximum file size, and a recommended 9:16 aspect ratio. Captions can contain up to 2,200 characters, 30 hashtags, and 20 @mentions. Accounts are limited to 100 API-published posts in a rolling 24-hour period, and a carousel counts as one post. IG User Media reference

Under Story limitations, the IG User Media reference says the API does not support link, poll, or location stickers. A Story that needs those stickers requires a native or reminder-based workflow.

Last verified: September 27, 2026. Velocity path: Instagram is a connected channel; confirm the carousel, Reel, Story, image, or video route before scheduling.

What you'll like

• The 10-item API limit is clear enough to shape the carousel before design work begins.
• The first slide's aspect ratio sets a consistent frame for the full carousel.
• Published Reel specifications make it easier to prepare a platform-specific video version.
• Caption and API-post quotas can be checked before the campaign enters the queue.

Why it might not be a good fit

• The campaign needs more than 10 carousel items through the direct API route. Use a native or reminder-based workflow instead.
• The creative depends on a native feature or sticker. Check whether the feature requires completion in Instagram's app.

Facebook: Best for community updates and visual posts

Best for

• Publishing community updates with supporting images, video, or links.
• Repurposing a campaign message for a broad Page audience.
• Keeping a campaign calendar aligned with Page content.

What it does

For organic planning, treat a Facebook multi-image post as its own visual post type. It is not evidence that an Instagram-style carousel will render the same way, and a paid carousel ad is a separate advertising format with separate specifications.

Use Meta’s Pages documentation to check the current Page post type and publishing requirements before scheduling. Confirm the Page’s eligibility for the specific format rather than assuming parity with Instagram because both are Meta products. Meta Pages API documentation

Last verified: September 27, 2026. Velocity path: Facebook is a connected channel; confirm the text, image, multi-image, video, or link-post route before scheduling.

What you'll like

• Text, images, video, and links give a campaign several organic Page-post options.
• A multi-image post can carry a visual sequence without claiming to be a native carousel.
• A Page post can sit beside the rest of the campaign plan in one calendar.

Why it might not be a good fit

• The campaign needs a paid carousel ad. That belongs in an advertising workflow, not an organic Page-post workflow.
• A Group, live, or another native workflow is central. Confirm the current connected route before promising it in the calendar.

TikTok: Best for vertical video and photo posts

Best for

• Publishing vertical video designed for a TikTok audience.
• Testing a photo-post concept where the approved publishing path supports it.
• Giving a short-form video its own hook, caption, cover, and review pass.

What it does

TikTok's Content Posting API supports direct posting for approved apps with the required authorization and scope. Its documentation covers video and photo posts, but direct publication depends on Direct Post configuration, approval for the `video.publish` scope, authorization from the target user, and TikTok's audit and visibility rules.

For an unaudited Direct Post client, TikTok allows up to five users to post in a 24-hour window and only permits `SELF_ONLY` viewership. An attempt to direct-publish to a non-private account is blocked. TikTok Content Sharing Guidelines and TikTok Direct Post reference

Treat a TikTok photo post or slideshow as a TikTok-specific adaptation, not as a guaranteed carousel equivalent across every market, account type, or connected tool.

Last verified: September 27, 2026. Velocity path: TikTok is a connected channel; confirm the video or photo-post route, authorization, and any native completion before scheduling.

What you'll like

• A properly approved and authorized Direct Post path can publish without a manual finish step.
• Photo posts give a campaign another TikTok-native adaptation beyond video.
• A TikTok-specific hook, caption, cover, and call to action can be reviewed separately from other channel versions.

Why it might not be a good fit

• The creative depends on a native effect, sound, or interaction. Plan a native completion step.
• The account lacks an approved direct-post route. An unaudited client cannot make a public Direct Post, and a non-private attempt is blocked.

YouTube: Best for short and long form video

Best for

• Publishing a video-led campaign with a clear channel strategy.
• Separating a short cut from a longer version of the same story.
• Managing titles, descriptions, thumbnails, and timing as one video workflow.

What it does

YouTube is a video destination, not a carousel destination. For standard channels, YouTube says square or vertical videos uploaded on or after October 15, 2024 and up to three minutes long are categorized as Shorts. A vertical two-and-a-half-minute cut is therefore a Short even if the campaign began as a long-form video plan. YouTube Help: Understand three-minute Shorts

If a video should remain long-form, YouTube’s guidance is to use a wider aspect ratio, such as 16:9. Plan the Short and standard-video version as different destination assets, with separate titles, descriptions, thumbnails, and calls to action.

Last verified: September 27, 2026. Velocity path: YouTube is a connected channel; confirm the short-form or standard-video upload, metadata, and thumbnail route before scheduling.

What you'll like

• The up-to-three-minute classification rule gives video teams a clear decision point before export.
• Wider framing provides a documented way to keep intended long-form video out of the Shorts classification.
• Separate video packages make the short and long cuts easier to review for their intended audience.

Why it might not be a good fit

• The campaign needs a routine text-and-image post rather than video. Use a different network or verify the exact native YouTube workflow.
• The launch depends on a native channel setting. Confirm that setting is available in the connected route before scheduling.

LinkedIn: Best for professional and document-led posts

Best for

• Turning an educational concept into a multi-page professional document.
• Publishing a text, image, MultiImage, video, article, or document update.
• Giving a business audience a distinct version of the campaign message.

What it does

LinkedIn's Posts API separates organic Documents and MultiImage from its named Carousel format. Documents are available for organic and sponsored posts. MultiImage is organic-only. The named Carousel format is sponsored-only, so a multi-page PDF that readers may call a "LinkedIn carousel" is technically a document post, not the API's Carousel format. LinkedIn Posts API

LinkedIn's Documents API limits documents to 100 MB and 300 pages across PPT, PPTX, DOC, DOCX, and PDF. Its MultiImage API requires 2 to 20 images and supports organic posts only. LinkedIn Documents API and LinkedIn MultiImage API

Last verified: September 27, 2026. Velocity path: LinkedIn is a connected channel; confirm whether the asset is a document, MultiImage post, video, or another post type before scheduling.

What you'll like

• A document can hold a full multi-page educational story when a few images are not enough.
• MultiImage provides an organic, image-led alternative when a document is not the right reading experience.
• LinkedIn documents the organic and sponsored routes separately, reducing ambiguity about which asset belongs in the plan.

Why it might not be a good fit

• The campaign requires LinkedIn’s named Carousel format. That is sponsored-only and belongs in an advertising workflow.
• The connected account or asset type is unconfirmed. Verify the document or MultiImage path before it becomes a recurring format.

X: Best for concise updates and media posts

Best for

• Starting a concise conversation around a campaign idea.
• Publishing a focused media update with tailored copy.
• Turning an educational sequence into a multi-image post or thread.

What it does

Do not plan an organic X post as an Instagram-style carousel. For this cross-network workflow, translate the campaign into a concise multi-image post or a thread, then rewrite the copy for the destination.

X’s developer documentation is the source of truth for current Posts endpoints, authorization, and access requirements. Recheck it before a campaign depends on a particular media capability or third-party publishing route. X Developer Platform documentation

Last verified: September 27, 2026. Velocity path: X is a connected channel; confirm the text, image, multi-image, video, or thread workflow before scheduling.

What you'll like

• A thread can carry a longer idea in smaller, discussion-ready pieces.
• A multi-image post gives a concise visual adaptation of a broader campaign.
• Rewriting the opening line for X creates a clearer entry point than copying a longer caption.

Why it might not be a good fit

• The campaign needs a paid carousel ad unit. Keep that separate from the organic publishing plan.
• The story needs a long document sequence. A LinkedIn document or Instagram carousel may preserve the structure better.

Bluesky: Best for text-led community updates

Best for

• Sharing a concise point of view with a conversation-first community.
• Supporting a text post with a small set of images.
• Testing a distinct channel voice rather than duplicating another network’s copy.

What it does

Bluesky's posting documentation supports up to four images in a post, and each image can have its own alt text. Treat this as a Bluesky-specific multi-image post, not an Instagram-style carousel; a 10-slide educational sequence must be shortened or redesigned. Bluesky posts documentation

Video and richer-media capabilities can change. Confirm the current post type and connected publishing route before building a recurring campaign around them.

Last verified: September 27, 2026. Velocity path: Bluesky is a connected channel; confirm the text, image, or video route before scheduling.

What you'll like

• Providing individual alt text makes a compact visual post more accessible.
• A text-led post gives the campaign a distinct conversational version.
• The image cap creates a clear reason to distill the idea instead of copying a longer carousel.

Why it might not be a good fit

• The campaign needs a long carousel or document. Four images cannot carry a full 10-slide explainer.
• The campaign depends on richer media. Confirm current support before making it a recurring format.

Can one tool publish carousels to Instagram, LinkedIn, and X?

One workflow can coordinate all three assets, but it cannot turn one identical carousel into the right organic format everywhere. Instagram has a native carousel, while LinkedIn's organic choices are a document or MultiImage post and X needs a multi-image post or thread. LinkedIn's named Carousel API format is sponsored-only.

For this use case, the right output is three platform-specific assets linked to one campaign plan. Velocity documents connected channels and says a strong social publishing workflow does not treat every network as the same, but confirm the direct route for each exact account and format before approving the queue.

How to choose a cross-network publishing workflow

Choose the workflow that makes platform adaptation visible rather than the one that only promises to post everywhere. A useful setup starts with one campaign message and then makes the media, copy, length, metadata, and approval state different for each network.

For recurring daily text-and-image work, a shared calendar reduces coordination time but does not remove the per-network format check. That check becomes more important when the campaign includes carousel-style education, short-form video, or a long-form cut.

How to adapt one campaign before scheduling

1. Choose the anchor asset. Begin with the core message, visual idea, or video, not a caption already written for one network.
2. Map the destination format. Decide what each network gets: carousel, document, MultiImage, thread, multi-image post, Short, standard video, or text plus image.
3. Check the current rule before building. For example: up to 10 carousel items through the Instagram API, up to 300 LinkedIn document pages, 2 to 20 LinkedIn MultiImage assets, up to four Bluesky images, and up to three minutes for a square or vertical YouTube Short.
4. Create platform versions. Adjust the hook, caption, media, aspect ratio, title, description, thumbnail, and call to action for the destination.
5. Confirm the route, then review. Check current platform rules and the tool’s documented support for the exact account and format, approve the version in the queue, and leave room for a native step when needed.

This reference compares documented publishing routes; it is not a claim of hands-on testing for every account and format combination.