@type t() :: %OpenXchangeClient.Model.AttachmentData{
attached: integer() | nil,
categories: String.t() | nil,
color_label: integer() | nil,
created_by: String.t() | nil,
creation_date: integer() | nil,
file_mimetype: String.t() | nil,
file_size: integer() | nil,
filename: String.t() | nil,
folder: integer() | nil,
folder_id: String.t() | nil,
id: String.t() | nil,
lastModifiedOfNewestAttachmentUTC: integer() | nil,
last_modified: integer() | nil,
modified_by: String.t() | nil,
module: integer() | nil,
number_of_attachments: integer() | nil,
private_flag: boolean() | nil,
rft_flag: boolean() | nil
}