> ## Documentation Index
> Fetch the complete documentation index at: https://connect.trypost.it/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Media

> Upload the file to Connect first. Then attach that URL on the post. We do not fetch files from the internet.

Connect does not download files from a public URL. There is no asset library and no “attach this image from the web.”

You ask Connect for an upload slot, put the bytes there, and pass the **public URL it gave you** when you create or update the post.

```mermaid theme={null}
sequenceDiagram
  participant App as Your product
  participant Connect
  participant Storage

  App->>Connect: Ask for an upload slot
  Connect-->>App: Upload URL + public URL
  App->>Storage: Put the file there
  Storage-->>App: Done
  App->>Connect: Attach that public URL on the post
```

The upload URL is signed. Do not send your API key to storage. It expires in **one hour**. An unused file is deleted after **7 days**; attaching it to a post keeps it.

Request shapes: [Presign](/docs/api-reference/media/presign) and [Upload](/docs/api-reference/media/upload). Agents use `request-media-upload-tool`, then the same public URL on create or update.

## What you can send

| Kind     | Formats              | Cap    |
| -------- | -------------------- | ------ |
| Image    | JPEG, PNG, GIF, WebP | 10 MB  |
| Video    | MP4, MOV             | 1 GB   |
| Document | PDF                  | 100 MB |

No standalone audio. No WebM. Networks often impose a tighter cap when you **schedule or publish** — drafts are not blocked. See the [platform pages](/docs/platforms/linkedin).

Optional alt text (up to 2 000 characters). Each network may truncate it further.

## Per-network media

A post has shared media. One network can override that with its own files, inherit the shared set, or publish with **no** media.

Limits (count, GIF vs still, duration) run against whatever that network will actually send.

## What does not work

* Pasting `https://example.com/photo.jpg` (or any CDN you host)
* Browsing a library of past uploads
* Attaching a file after the post exists as a separate “media” step — it goes on the post itself