Send an image or PDF in a WhatsApp chat with MCP

Upload a file you already have and send it as image, video, or PDF inside an open WhatsApp customer service window.

send_conversation_media sends an image, video, or PDF inside an open customer service window. The assistant does not generate the file. You provide a file you already have. Outside the 24-hour window, this send is rejected and the assistant uses an approved template instead.

Ask this

Upload this PDF as a chat document and send it in the open conversation with [phone], with the caption "Invoice for order 10482". If the 24-hour window is closed, stop and tell me.

What the assistant calls

1. Read the file rules

   get_media_guidelines runs before the upload. HTML, SVG, scripts, and executables are rejected. A partial or cut-off file is rejected and is not a media id.

2. Upload

   upload_media hosts the file. Pass a public https URL or one complete base64 value up to 5 MB, plus mimeType and filename when you have them.

3. Send in the thread

   send_conversation_media takes the conversation id, mediaType of image, video, or document, and mediaUrl from the upload or a complete mediaBase64. A public URL is sent as a link. The caption is optional. The assistant sends it only after you ask, and only while sessionExpiresAt from list_conversations is still in the future.

Template header files and catalog images follow different size rules. Those are on Media. Thread tools are on Inbox.