我正在使用OpenAPI 3.0的Swagger编辑器。我需要记录一个上传图片的路径。当我尝试“尝试一下”时，我没有让文件浏览器在请求正文中选择要上传的图片，我得到的只是一个带有参数名称和类型的JSON字符串。

这是路由的YAML描述：

openapi: 3.0.0
...
paths:
  /media/upload/thumbnail:
    post:
      tags:
        - media
        - publications
      security:
        - bearerAuth: []
      summary: upload a kid's publication
      operationId: uploadPublication
      requestBody:
        content:
          multipart/form-data:
            schema:
              type: object
              properties:
                upload:
                  type: string
                  format: binary
      responses:
        '200':
          description: Successful operation
          content:
            application/json:
              schema:
                type: object
                properties:
                  id:
                    type: string
                    description: ObjectId of the uploaded file in db (original size)
                    example: 5a6048b3fad06019afe44f24
                  filename:
                    type: string
                    example: myPainting.png
                  thumbnail:
                    type: string
                    description: ObjectId of the uploaded file in db (thumbnai size)
                    example: 5a6048b3fad06019afe44f26
        '400':
          description: Authentication failed

我错过了什么？