Great Youtube Video, thanks for posting, I have the exact same buttons ans 12" Uconnect as that guy so I could follow step by step.
Just an FYI, Upfitter switches are not the same as AUX switches. Did you mean to say aux switches or you're actually talking about Upfitter stitches?
When building my truck I've considered the AUX switches but decided I'd add them later if and when I need them, in hindsight I should have ordered AUX from the factory.
But while researching the switches, I found out the Upfitter could NOT be added later on as it's much more involving process (well anything could be added or changed it's just not so easy).