OpenAPI spec defines the possibility to specify parts of multipart request:

requestBody:
  content:
    multipart/form-data:
      schema:
        type: object
        properties:
          metadata:
            type: object
            properties:
              propA:
                type: string
              propB:
                type: string
          file:
            type: string
            format: binary

However, I'm looking for a way, do define arbitrary (dynamic) number of files, which can be sent on the API.

E.g. something like this:

requestBody:
  content:
    multipart/form-data:
      schema:
        type: object
        properties:
          metadata:
            type: object
            properties:
              propA:
                type: string
              propB:
                type: string
          file:
            type: array
            items: 
              type: string
              format: binary

Is this supported by OpenApi spec ?