Optional
descriptionString. A plain-text description of the media, for accessibility purposes.
Object. The file to be attached, encoded using multipart form data. The file must have a MIME type.
Optional
focusString. Two floating points (x,y), comma-delimited, ranging from -1.0 to 1.0. See Focal points for cropping media thumbnails for more information.
Optional
thumbnailObject. The custom thumbnail of the media to be attached, encoded using multipart form data.