Create Attachment Request
public CreateAttachmentRequest CreateAttachmentRequest(@Json(name = "filename" ) String filename, @Json(name = "content_type" ) String contentType, InputStream content, @Json(name = "size" ) Integer size, @Json(name = "is_inline" ) Boolean isInline, @Json(name = "content_id" ) String contentId, @Json(name = "content_disposition" ) String contentDisposition)