put https://rz3.aeb.de/demo1docs/rest/DocumentService/documentInstance///
Update specified document instance.
Uploads an external document which does not depend on templates of the document. The document type and reference object are resolved in the context of the session client. The archive options are defined in the referenced document type. Like POST /documentInstance/{referenceType}/{referenceNumber}/{documentType} the uploaded document can be queried, deleted and fetched by calling the corresponding method with the received documentId.The document also has a date to which this document is at least stored in the document store.
Currently only PDF up to a maximum size of 10MB is supported.