Where are copied photos and screenshots at on my iPhone?

Screenshots are in the Library in the Photos app. Copies should be there as well.

Settings > Photos

Tap the Library at the lower left of the screen

Screenshots may or may not be in Photos. When I take a screenshot, I am given the option of saving it to Photos or to Files. As it happens, I've created a specific file for screenshots called, with great creativity, "Screenshots". That way I know exactly where all of my screenshots are.

"Files" is an app on the iPhone. I created a folder within that app called "Screenshots". Because I keep my files synced through iCloud, I also see the folder on my computer.

Find files on your iPhone or iPad in the Files app - Apple Support

Note that, unless you have explicitly chosen to save screenshots to Files, they will not be there. I have no way of knowing what you have done with yours.

This problem is a reason to move work to Windows

So the file is a folder? Where do you keep this file? How is it created?

could be a great solution once documented.

I looked in my photo app and there’s no library in my setting,WHY ?