Most n8n templates for posting video wire up each platform's API on its own, with its own app review, tokens and limits. A simpler workflow sends the video once to a publishing API and lets it reach every platform. Step by step, with the HTTP Request node.
Cross-posting one video to TikTok, YouTube, Instagram, Facebook, X, LinkedIn, Threads, Pinterest and Bluesky is mostly the same job nine times, except for the parts that aren't. A field guide to what changes per platform: shape, length, captions, privacy, scheduling and AI labels.
Posting a TikTok as a Reel or a Short is mostly the same video with a few changes that decide whether it works: the watermark, the music, the length, the caption and the cover. A step-by-step checklist, based on what each platform actually says.
Instagram, TikTok and YouTube each have a built-in scheduler, with different rules on who can use it, how far ahead you can schedule and what doesn't work. Step by step for all three, from their own help pages, plus when a cross-platform scheduler makes more sense.
The Model Context Protocol lets assistants like Claude and ChatGPT call real tools, including ones that publish to social media. How it works, how to connect a publishing server, and the guardrails to put in place before an agent can post for you.