Fix: solved "Owned media must be a url or base64" error when sending base64 files

[isthevao]

I was getting this error when trying to send a base64 file:
{'status': 400, 'error': 'Bad Request', 'response': {'message': ['Owned media must be a url or base64']}}

This fix adjusts the payload, allowing base64 media to be sent correctly.

Summary by Sourcery

Bug Fixes:

• Add 'media' field to the multipart form payload to support base64 media in send_media

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Updated the send_media method to correctly include base64 media in the multipart payload.

Sequence diagram for sending base64 media with send_media

sequenceDiagram
participant Client
participant MessageService
participant API
Client->>MessageService: send_media(instance_id, message, instance_token)
MessageService->>API: POST media payload (includes 'media' field with base64)
API-->>MessageService: Response (success or error)
MessageService-->>Client: Return API response

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Class diagram for updated MediaMessage usage in send_media

classDiagram
class MediaMessage {
  +mimetype: str
  +caption: str
  +fileName: str
  +media: str
}
class MessageService {
  +send_media(instance_id: str, message: MediaMessage, instance_token: str)
}
MessageService --> MediaMessage

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File-Level Changes

Change	Details	Files
Enable base64 media sending by adjusting the multipart payload	Added 'media' field to the payload in send_media Specified media part as text/plain for base64 content	evolutionapi/services/message.py

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