'Swagger. How to define file download operation correctly

I use online Swagger Editor with OpenAPI 3.0 and I have to create a definition file download. I develop server-side and a customer should be able to create a client using YAML description without my "addition explanation". The relevant part of YAML is:

/files/download/{fileName}:
get:
  summary: download file
  operationId: downloadFile
  description: this API is for file download
  parameters:
    - in: path
      name: fileName
      schema:
        type: string
      required: true
      description: The name of file to download
  responses:
    200:
      description: Operation performed successfully.
      content:
        application/octet-stream:
          schema:
            type: string
            format: binary
   ...

The questions are:

Content. Currently, it is defined as octet-stream as a most common type, but actually, it depends on the type of a file from some predefined set of file types. Is there any way to define such kind of mapping (file type/content type) and use it with a content tag?
The response header should include a key/value pair attachment or inline and file name. The file name is defined in path - {fileName}. Is there any way to describe the concatenation of enum {attachment, inline} and the value of fileName?

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'Swagger. How to define file download operation correctly

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