Hi,
Let's start by editing KalturaClientTester/KalturaClientTester.cs, setting your partner info like I said and running the unit tests to make sure they all pass.
We do that nightly as part of our CI and it works correctly, as you can see here:
https://travis-ci.org/kaltura/KalturaGeneratedAPIClientsCsharp
Once that works for you, you can create the minimal code snippet that uploads based on the code in the units and if that does not work for you, paste the full code sample so I can help you debug it.