It is possible for a Developer to upload a build directly from within the Luna Replay plugin in Unity:
Simply select: Tools > Luna Replay > Building for Create > Build Linux and Upload.
We recommend testing in Unity editor before uploading to Creative Suite.
Also make sure to have already tagged your game's variables you wish to edit in Create with the
LunaCreative SuiteField attribute. (More on this here)
Or you can export a Create build locally and upload to Create manually by following these steps:
Generated a Linux build either using Luna Replay or manually using Unity.
Navigate to Creative Suite in your browser and ensure you're signed in.
Drag and drop the compressed folder containing your Create build to the Cloud icon in the apps page in Creative Suite.
You can read more on uploading builds here.