API: Direct Asset Upload to the Content Piece

Currently, images/attachments can only be uploaded via the API to "Briefing & Resources," not directly into the content piece itself (e.g., a social media post with an image). The current workaround (downloading and re-uploading to Assets) is impractical for bulk workflows. Request: An API endpoint to assign/upload assets directly to a content piece. Additionally, check whether DAM tools such as Kanto offer their own MCP server to connect assets directly.