My pics that are Portrait or not showing as Portrait, so I’m not able to get the blur background option

regarding the below Apple instructions- my pics that I took in portrait or not showing a banner saying ‘portrait’ above pic, thus I’m not getting the blur option.

I have a compatible iPhone 11 Pro.

Edit Portrait mode photos on iPhone - Apple Support

Adjust Depth Control in Portrait mode photos

Use the Depth Control slider (on supported models) to adjust the level of background blur in your Portrait mode photos.

1. Tap any photo taken in Portrait mode to view it in full screen.
2. Tap Edit, then tap 

1. at the top of the screen.
2. A slider appears below the photo.
3. Drag the slider left or right to adjust the background blur effect.
4. Tap Done to save your changes.