On my Streamdeck the buttons will work, even though they aren't showing anything but the default Vmix grid. However, my shortcut Web Controller, they don't show up at all... but if you guess where they might be, and hover over that area and click that blank spot in the Web Controller they will activate.

So, this seems like I'm hitting some kind of ceiling on how many display Thumbnails are allowed.

Maybe there is a better workflow for me, and this is a dumb way to do it. However, I was hoping to have like a hundred or so of these thumbnails, as these are for reaction GIF/Videos and the more the better.