Hello Robert!
I see you have updated to a Windows 10 (64Bit), and this is not allowing your iPhone 6 to be shown in Windows Explorer/File Explorer right?
Understanding why you can't connect your iPhone 6 to Windows 10 (64Bit)
You still can transfer photos to your computer even if it is Windows 10, (64Bit).
That's not the problem.
The problem is, sometimes the iOS of your iPhone has a hard time establishing a connection with Microsoft's Windows (since it is both different platforms all together), and this results quite often with bugs and errors. One of the most common bugs faced being where you can't connect your iPhone to show up on the Windows PC (Even I was where you are right now)
Solution (Reinstalling Driver)
Here are the five steps
Step 1: Connect your iPhone to your PC
Step 2: Search Box (Bottom-Left), Type and Open Device Manager, and Expand Universal Serial Bus controllers
Step 3: Under Universal Serial Bus controllers, you will see Apple Mobile Device USB Driver. Double-click it to open its Properties
Step 4: Go to the Driver tab and Uninstall the driver
Step 5: Disconnect your iPhone, and Connect it again (Windows 10 will search and download the driver again)
Alternative Method (Reinstalling iTunes)
Step 1: Uninstall iTunes. Go to Apple’s website and Install iTunes again
Step 2: Connect your iPhone to your PC
Step 3: Open Device Manager, and Expand Universal Serial Bus controllers
Step 4: Under Universal Serial Bus controllers, you will see Apple Mobile Device USB Driver. Double-click it to open its Properties
Step 5: Go to the Driver tab and Update the driver
Alternative Method (Installing Windows updates)
Try installing the following two updates.
(Please choose to download the correct version according to your own operating system.)
https://support.microsoft.com/en-us/kb/3010081
https://support.microsoft.com/en-us/kb/3099229
If you still can't get it, you can always try messaging your problem to Saint, via Snapchat (You can take a picture/snap of your problem, and they will solve it for you.)
Add Saint on Snapchat (Username: saintlad)
Sources