I saw On Tour when it came out. That was the first film i watched in the cinema at the age of 11. But that's not really "an Elvis film" as regards this discussion. In the 1970s, as those of us who were alive in the 1970s will know, you would get a small cinema showing old films and often as double bills long after the films were made. Carry On, James Bond, that sort of thing. And Elvis. That's how I saw some of them on the big screen, and the rest were on TV. Then VHS etc. I did go to a 48 hour non-stop filmshow after he died, above a pub in Leeds. A few dozen of us in a room the size of our kitchen, breaking every fire regulation known to man.
On the whole, I can't watch them now. He was a dreadful actor, I don't care what anyone says, and they're mostly embarrassing. And you won't find a bigger Elvis lover than me, so it's not something I like to say.