# 50511: Invalid message media content type

Log Level: ERROR

## Description

An invalid multimedia attachment content type was supplied.

### Possible causes

* The MIME content type of multimedia attachment you are trying to send is not acceptable for this conversation.

### Possible solutions

* Make sure that the content type of multimedia attachments conform to channel constraints. Check for accepted MIME types in [API documentation](/docs/conversations/conversations-limits#media-limits).