# Drop to CDN for Buffer

> Buffer's API and MCP server need a direct URL for every image or video. Upload to Drop to CDN and hand Buffer the link — from curl, Zapier, Make, or Claude.

Buffer's API and MCP server take a media asset shaped like { image: { url } } or { video: { url } } — a direct, publicly reachable link, never raw file bytes or a local path. Upload the file to Drop to CDN first and pass the returned url to Buffer.

## Why Buffer needs a URL

It fetches the media itself — it doesn't accept raw bytes.

- Buffer's dashboard composer accepts a local file because your browser uploads it straight to Buffer.
- Buffer's API and MCP create_post tool instead take an asset URL that Buffer's servers fetch on their own.
- Local paths and data: URIs fail validation before the post is ever scheduled.

## Three steps to post from anywhere

Upload once, then point Buffer at the link.

- Upload your image or video — dashboard, one curl POST, or an MCP tool call.
- Copy the CDN URL — the response includes id, url, expires_at, size, and mime_type, and the url is public immediately.
- Hand it to Buffer — paste the url into the post's image or video asset from the API, an automation, or an AI agent calling create_post.

## Claude + Buffer, one prompt

Connect both, and Claude does the hand-off for you.

- Claude schedules a Pinterest pin: it calls Drop to CDN's upload_file, then Buffer's create_post with the returned URL and your board ID.
- A script posts a generated chart: render to PNG in memory, upload, and call Buffer's API with the CDN url.
- Zapier or Make hands off the URL: upload in one step, map the returned url into a Buffer step in the next.

## Buffer + Drop to CDN FAQ

Common questions about posting media through Buffer.

### Does Buffer's API accept a file upload directly?

No. Buffer's API and MCP server take an asset shaped like { image: { url } } or { video: { url } }, and the url must be a direct, publicly reachable link Buffer can fetch. Neither accepts raw file bytes or a local path.

### Which networks actually require an image or video?

Instagram and TikTok need an image or video to post at all. Pinterest needs an image plus a board ID. YouTube needs a video, a title, and a category. Twitter, Mastodon, Threads, and Bluesky can go out as text only.

### How long does the file need to stay live?

Buffer fetches media at publish time, so the URL must stay reachable while the post sits queued. Set retention past your furthest scheduled date, or use never-expire on a paid plan.

### Does this work with Zapier or Make instead of Claude?

Yes — the pattern is identical: upload the file with a Zapier or Make step first, then map the returned url into whatever step calls Buffer.

## More from Drop to CDN

- [Home](https://droptocdn.com/)
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- [n8n Integration](https://droptocdn.com/integrations/n8n)
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- [Activepieces Integration](https://droptocdn.com/integrations/activepieces)
- [MCP (Cursor, Claude)](https://droptocdn.com/integrations/mcp)
- [Buffer Integration](https://droptocdn.com/integrations/buffer)
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