This is what I've submitted via Feedback - Photos - Apple :
Prior to iOS 18, the Photos app provided a folder called "Recents" where a user could review the photos they'd taken using that phone (as well as photos saved from messages, screenshots, etc) in order to decide which to keep, which to upload to their Mac, etc. In iOS 18, the Photos app lost that functionality. The photos described above are shown mixed up with photos synced from other sources, making it impossible to do the triage. I cannot overstate the seriousness of this loss of functionality.
At https://discussions.apple.com/thread/255760698, I see that there's a clumsy workaround in the Camera app. This doesn't work on my iPhone.
Note: I don't use iCloud Photos. I sync selected photos from our Mac to my iPhone.
> The iOS version drop-down below doesn't include iOS 18.