Well, hate to answer my own question, but figured it out. Camera has to be "hidden" to show up in that list. Seems like a design flaw to me. Not sure why you would have to mark the camera hidden to be able to filter clips/videos!

Hello. I am having an issue where on the WebUI, if I click on "Alerts" or "Clips" tabs, then click the drop down for "Filter Alerts By", only one of my cameras shows in the list. I have "All Cameras, All Cameras Cycle, and then my one other camera named Driveway&qu...