This device is not reachable iPhone12 Pro

While I was transferring some images & videos from the DCIM using my Windows 10 Laptop, I faced his issue so I decided to search and write about it,
The only way to figure this out is by setting an option called ‘Transfer to Mac or PC.’  in the settings/photos to Keep Originals Like the image Below 

That's all you need to do, then unplug the iPhone then plug it into your Laptop again 
Hope you find this useful 

Good Luck!