Hello KP75075,
Thank you for reaching out to the Microsoft Community and I'll be glad to assist you today.
I understand that you are trying to move your Photos from your Samsung device to your Windows 10 PC. However, you are having trouble connecting your mobile device to your computer.
The computer will only show up your Samsung Phone when you accept the prompt from the Samsung mobile device first. So, ensure you have enabled 'USB debugging' option in the Samsung device.
You can find this option in your Samsung mobile device settings > Scroll down and select About phone > Software information > Build number > Tap the build number option 6-7 times to enable developer options. In settings > Scroll down > In developer options, ensure to enable the USB debugging option.
Once enabled, connect your mobile device to your computer and see if you get any notification on the mobile device to transfer files between your device.
Regarding the Windows Hello feature which says 'Unavailable' is due to a software error.
Delete the NGC folder and add a new PIN code:
a. Open Windows Explorer.
b. navigate to the following path: (make sure to select view > hidden items checkbox)
C:\Windows\ServiceProfiles\LocalService\AppData\Local\Microsoft\NGC.
c. Open the NGC folder and delete all the contents to empty the folder.
d. Now, go to settings > Sign-in options to see if you can set up a PIN.
In addition, make sure you have installed all the latest updates for your PC. Also, ensure you have the latest version of the Phone link app installed from the Microsoft store.
https://apps.microsoft.com/detail/9nmpj99vjbwv
I hope this information helps. If you have any questions, please let me know and I will be happy to help you further.
Best regards,
Gunasekar N