This is a low level function that only works on attachments retrieved with gm_attachment().
To save an attachment directly from a message see gm_save_attachments(),
which is a higher level interface more suitable for most uses.
See also
Other message:
gm_attachment(),
gm_delete_message(),
gm_import_message(),
gm_insert_message(),
gm_messages(),
gm_message(),
gm_modify_message(),
gm_save_attachments(),
gm_send_message(),
gm_trash_message(),
gm_untrash_message()
Examples
if (FALSE) {
my_attachment <- gm_attachment("a32e324b", "12345")
# save attachment to a file
gm_save_attachment(my_attachment, "photo.jpg")
}