I understand that you have created a base view in Design Studio using the Data Catalog export API and no zip file has been generated. So, as a first step, verify that the base view created from the Data Catalog export API is executed successfully without any errors.
Usually, while accessing the [Data Catalog endpoints](https://community.denodo.com/docs/html/browse/8.0/en/vdp/data_catalog/appendix/rest_api/rest_api#rest-api) from Virtual DataPort, a JSON datasource has to be created and it expects the result to be in the JSON format. But this export API call returns the result in the file format. Hence, this could be the possible cause for the zip file not being generated. So, you may need a [SSH Custom wrapper](https://community.denodo.com/docs/html/document/denodoconnects/8.0/en/Denodo%20SSH%20Custom%20Wrapper%20-%20User%20Manual) in order to implement this.
However, if you would like to have further assistance regarding this setup and if you have valid Support access, then I suggest you to open a new Support case where we could assist you more.
Hope this helps!