How to see what photos have been stored in iCloud

You can see your iCloud Photos Library on the web page www.icloud.com . Sign in with your iCloud AppleID, then tap the Photos icon. You need to do this on a computer. This web page requires the Desktop Version. Or, on your iPad, do as described here: https://browserhow.com/how-to-request-and-view-desktop-site-on-safari-ios-ipados/

View photos from iPad itself see the article View photos and videos in the Photos app on iPad - Apple Support