def contents
      RelationProxy.new(self, Content, [Operations::Create, Operations::Find]) do
        def create(mime_type, file, client = self.client)
          response = client.post(url, {}, {
            'Upload-Content-Type' => mime_type,
            'Upload-Content-Length' => file.size
          })

          attributes = response.merge('size' => file.size, 'mime_type' => mime_type)

          Content.from_response(attributes, client).tap do |content|
            content.upload(file)
          end
        end
      end
    end
def contents
      RelationProxy.new(self, Content, [Operations::Create, Operations::Find]) do
        def create(mime_type, file, client = self.client)
          response = client.post(url, {}, {
            'Upload-Content-Type' => mime_type,
            'Upload-Content-Length' => file.size
          })

          attributes = response.merge('size' => file.size, 'mime_type' => mime_type)

          Content.from_response(attributes, client).tap do |content|
            content.upload(file)
          end
        end
      end
    end
Allows creating and finding of the conversation's rich content

 @return [Layer::RelationProxy] the conversation's rich content
 @!macro platform-api