icloud photos help

I am opening iCloud.com on my PC. Sometimes, not always, when I select photos, click on the plus sign, then identify the album or folder where I want them to go, nothing happens (i.e., they don't show up in the album/folder). I do not get an error message, they just don't show up in the designated album/folder. I tried selecting the photos, clicking on the plus sign, and creating a new album or folder. Sometimes that works. Often, I will select multiple photos and only a few of them go.

I was working in Chrome. I just tried it in Edge and it seems to work much better. Thank you!