Imports from Zemax/Opticstudio are done through .zmx files. Binary file imports are not supported. That also means probably only sequential lens designs only**. Once you are in the KostaCLOUD workspace (after successful login through CLOUD Portal, click the NEW button on the bottom menu bar. Select Import File.
The imported file will show up as a tab on the bottom menubar. Use the bottom scroll bar to locate it, if you have more than one file in your directory. Click it, and Kostacloud will display the imported optical system. Look for a tutorial video on 'First COTS Import Lens'.
If you have a multi-configuration system in zemax/opticstudio, for now, you probably have to import each configuration into KostaCLOUD individually.
**A non-sequential system import workaround can be through importing it as a CAD model. Look for CAD import in product release schedule.