resources :upload_files do
  member do
    get :download
  end
end

 def download
    upload_file = UploadFile.find(params[:id])

    file = upload_file.file.blob.download  #to download

    if send_data(file, disposition: 'attachment',  #Send the downloaded file
      filename: upload_file.file.blob.filename.to_s, #Get file name
      type: upload_file.file.blob.content_type) # content_Get type
      head :no_content #If you can send, no_Returns content
    else
      render json: upload_file.errors, status: :not_found  #Returns an error
    end
  end

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