Optional: Changing this setting is not recommended. Use ShowUpload to control whether the upload control that lets you upload a file will be displayed when you call one of the ShowAcquire methods. Set to RelationshipType.Attach or RelationshipType.Link, if you want to be able to upload files with the control. Attach is recommended. Link will cause a new asset to be created.
A RelationshipType param. Default is RelationshipType.Attach