Get the object tree of an uploaded file using the Model Derivative API.
Arguments
- guid
 A string. GUID retrieved via the
getMetadatafunction.- urn
 A string. Source URN (objectId) for the file. Note the URN must be Base64 encoded. To encode the URN, see, for example, the
jsonlite::base64_encfunction.- token
 A string. Token generated with
getTokenfunction withdata:readanddata:writescopes.