Use your external display as a mirror. The high quality cameras let you to zoom in for details.
With the phone closed, open the camera:

To zoom in/out, tap 


To take a selfie from the mirror:



Scan paper documents to save them as JPG files.
If needed:



To view or share the scanned document later, use the Adobe Scan app, Photos app or Files app.
You can use 
To use Google Lens:
In the Camera app, tap 
If you don't see 


Tap the item you want to learn about.
For text, tap it to select it, and use 
In the list of results:
To learn more, read Google's help.