Content to add.
OptionalmetadataOptional metadata. If metadata is not specified then metadata from previousVersion is automatically used. If specified, then all metadata must be specified because it will be used instead of metadata from previousVersion.
Type of operation. In this case 'append' to represent that the operation will add new version to a existing change.
Previous change to add version to. If Change.etag on previousVersion differs from backend value then the operation will fail.
Defines what is required to append a version to a existing change. This can be a existing change like a file or a attachment.