Cannot Add Photo to Album

Hi, I have an iphone 12 mini. I've created an album on the iphone and I've followed online instructions for how to add a photo to an album, but it won't work. If I click on a photo, then click top three dots, then click "Add to Album", I see the album I want to add it to in "My Albums" section. But, when I click the desired album, I'm simply taken to that album. It doesn't actually add the photo. There's no way to complete and confirm that action to make it add the photo; there's no "enter" function. So, it's like I'm stuck. I also tried doing the same function on my laptop in icloud website, and I run into the exact same same problem. Yes my iphone is updated.