So... the first video is so bad I could not watch it. Lutron really, really needs to update that. The article you linked was written by a pediatrician.
It would be helpful to know which Caseta devices you are using. Some Caseta dimmers work with (1) mechanical 3-way switch. Some require replacing one of the 3-way switches with a Pico remote. If your light is switched from more than 2 locations, you must use Pico remotes in the other locations. I have included the link to "Caseta Advanced Instructions" which may help.
www.lutron.com/TechnicalDocumentLibrary/0301710a_Caseta%20Advanced%20Instructions.pdf