There seems to be a Problem with selecting the correct storage in the CAD-API. It’s not possible to change the storage to your own and all the files you upload are uploaded to a non anonymous shared storage. If I compare two storage Aspose apireference request of the CAD-API and the PDF-API they return different results:
Request URL 1: https://api.aspose.cloud/v3.0/pdf/storage/internal/exist
returns “Exists”: true
Request URL 2: https://api.aspose.cloud/v3.0/cad/storage/internal/exist
returns “exists”: false