Unable to crop photos while editing on my iPhone 16 Pro Max with iOS 18

Define "does not work".

What exactly happens when you try to crop a photo then?

You tap on the Photo, then tap on the adjustments icon at the bottom then on crop and then drag the sides of the adjustment border to crop the photo. Tap on done when you're finished cropping.

click here ➜ Crop, rotate, flip, or straighten photos and videos on iPhone - Apple Support

Have you tried a forced restart? 

Force restart iPhone - Apple Support

This is different from a simple Power Off. I had to continue holding the button down past the "slide to power off" message, and then I released the button only after  the Apple Logo appeared indicating a re-start. 

What is your iOS? is it 18.3, 18.4 ?

I choose "crop" from the edit menu, and then I choose the icon at the top that shows different sizes (if you use your imagination,

and I pick either FREEFORM or a preset aspect ratio. Then I grab the corners and drag them in. If you don't choose that top sizes icon, then cropping should be in freeform.

Is this what you've done? What happens, and at what point?