PDF to PPT conversion via API service

I am integreting Adobe API service to convert PDF to PPT. When I try the same flow-

Generate Access Token

Get AssetID

Upload document

Export PDF

Check Status

All goes fine, same goes fine in my node js apllication as well but download link via postman gives me proper PPDF file but same via nodejs apllication gives blank pages.

Any help appricated.

Thanks

Geeta