OptionaldescriptionDescription of the attachment
OptionaldoctypeDocument type (e.g., 'Attachments'). Supports 'DOCTYPE' or 'URLTYPE/DOCTYPE' format
OptionalcontentContent-Type of the file data
OptionalcustomSet to 'base64' to indicate the body is base64-encoded data (uses custom-encoding header)
OptionalencslugBase64-encoded file name for non-ASCII characters
OptionalencdescriptionBase64-encoded description for non-ASCII characters
OptionalcontentContent-Location header for URL/WWW type attachments
OptionalcustomCustom headers to include in the request
Options for uploading attachments