Human nature
I was looking for what the symbols mean on hilton Floorplan and came across this thread. I'm no expert on getting upgraded but I do have some thoughts on checking in and when don't get an upgrade, you show the app. I think it would work better to say upfront - I see on the app there is such and such upgrade available. Any chance I can be upgraded. Human nature will be if confronted after being told none available - the clerk will most likely double down on no.
Also in reply to person who said haven't been able to check in on the app, I have an option to check in which is why I'm looking at this site. It's at a Hampton.